diff --git a/src/theme/book.css b/src/theme/book.css
deleted file mode 100644
index 16129aef..00000000
--- a/src/theme/book.css
+++ /dev/null
@@ -1,1465 +0,0 @@
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-.navy a > .hljs {
-  color: #2b79a2;
-}
-.navy .theme-popup {
-  color: #bcbdd0;
-  background: #161923;
-  border: 1px solid #737480;
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  display: none;
-}
-.navy .theme-popup .theme:hover {
-  background-color: #282e40;
-}
-.navy .theme-popup .default {
-  color: #737480;
-}
-.navy blockquote {
-  margin: 20px 0;
-  padding: 0 20px;
-  color: #bcbdd0;
-  background-color: #262933;
-  border-top: 0.1em solid #2f333f;
-  border-bottom: 0.1em solid #2f333f;
-}
-.navy table td {
-  border-color: #1f2331;
-}
-.navy table tbody tr:nth-child(2n) {
-  background: #1b1f2b;
-}
-.navy table thead {
-  background: #39415b;
-}
-.navy table thead td {
-  border: none;
-}
-.navy table thead tr {
-  border: 1px #39415b solid;
-}
-.navy :not(pre) > .hljs {
-  display: inline-block;
-  vertical-align: middle;
-  padding: 0.1em 0.3em;
-  border-radius: 3px;
-  color: #c5c8c6;
-}
-.navy a:hover > .hljs {
-  text-decoration: underline;
-}
-.navy pre {
-  position: relative;
-}
-.navy pre > .buttons {
-  position: absolute;
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-  right: 5px;
-  top: 5px;
-  color: #c8c9db;
-  cursor: pointer;
-}
-.navy pre > .buttons :hover {
-  color: #2b79a2;
-}
-.navy pre > .buttons i {
-  margin-left: 8px;
-}
-.navy pre > .buttons button {
-  color: inherit;
-  background: transparent;
-  border: none;
-  cursor: inherit;
-}
-.navy pre > .result {
-  margin-top: 10px;
-}
-.navy .icon-button {
-  border: none;
-  background: none;
-  padding: 0;
-  color: inherit;
-}
-.navy .icon-button i {
-  margin: 0;
-}
-.navy ::-webkit-scrollbar {
-  background: #161923;
-}
-.navy ::-webkit-scrollbar-thumb {
-  background: #c8c9db;
-}
-.navy #searchbar {
-  border: 1px solid #aaa;
-  border-radius: 3px;
-  background-color: #aeaec6;
-  color: #000;
-}
-.navy #searchbar:focus,
-.navy #searchbar.active {
-  -webkit-box-shadow: 0 0 3px #aaa;
-  box-shadow: 0 0 3px #aaa;
-}
-.navy .searchresults-header {
-  color: #5f5f71;
-}
-.navy .searchresults-outer {
-  border-bottom: 1px dashed #5c5c68;
-}
-.navy ul#searchresults li.focus {
-  background-color: #242430;
-}
-.navy mark {
-  background-color: #a2cff5;
-}
-.rust {
-  color: #262625;
-  background-color: #e1e1db;
-/* Inline code */
-/* Search */
-}
-.rust .content .header:link,
-.rust .content .header:visited {
-  color: #262625;
-}
-.rust .content .header:link:hover,
-.rust .content .header:visited:hover {
-  text-decoration: none;
-}
-.rust .menu-bar {
-  margin: auto -15px;
-}
-.rust .menu-bar > #menu-bar-sticky-container {
-  background-color: #e1e1db;
-  border-bottom-color: #e1e1db;
-  border-bottom-width: 1px;
-  border-bottom-style: solid;
-}
-.rust .menu-bar.bordered > #menu-bar-sticky-container {
-  border-bottom-color: #d7d7cf;
-}
-.rust .sidebar {
-  background-color: #3b2e2a;
-  color: #c8c9db;
-}
-.rust .sidebar::-webkit-scrollbar {
-  background: #3b2e2a;
-}
-.rust .sidebar::-webkit-scrollbar-thumb {
-  background: #c8c9db;
-}
-.rust .chapter li {
-  color: #505254;
-}
-.rust .chapter li a {
-  color: #c8c9db;
-}
-.rust .chapter li .active,
-.rust .chapter li a:hover {
-/* Animate color change */
-  color: #e69f67;
-}
-.rust .chapter .spacer {
-  background-color: #45373a;
-}
-.rust .menu-bar,
-.rust .menu-bar:visited,
-.rust .nav-chapters,
-.rust .nav-chapters:visited,
-.rust .mobile-nav-chapters,
-.rust .mobile-nav-chapters:visited,
-.rust .menu-bar .icon-button,
-.rust .menu-bar a i {
-  color: #737480;
-}
-.rust .menu-bar i:hover,
-.rust .menu-bar .icon-button:hover,
-.rust .nav-chapters:hover,
-.rust .mobile-nav-chapters i:hover {
-  color: #262625;
-}
-.rust .mobile-nav-chapters i:hover {
-  color: #c8c9db;
-}
-.rust .mobile-nav-chapters {
-  background-color: #3b2e2a;
-}
-.rust #searchresults a,
-.rust .content a:link,
-.rust a:visited,
-.rust a > .hljs {
-  color: #2b79a2;
-}
-.rust .theme-popup {
-  color: #262625;
-  background: #e1e1db;
-  border: 1px solid #b38f6b;
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  display: none;
-}
-.rust .theme-popup .theme:hover {
-  background-color: #99908a;
-}
-.rust .theme-popup .default {
-  color: #737480;
-}
-.rust blockquote {
-  margin: 20px 0;
-  padding: 0 20px;
-  color: #262625;
-  background-color: #c1c1bb;
-  border-top: 0.1em solid #b8b8b1;
-  border-bottom: 0.1em solid #b8b8b1;
-}
-.rust table td {
-  border-color: #d7d7cf;
-}
-.rust table tbody tr:nth-child(2n) {
-  background: #dbdbd4;
-}
-.rust table thead {
-  background: #b3a497;
-}
-.rust table thead td {
-  border: none;
-}
-.rust table thead tr {
-  border: 1px #b3a497 solid;
-}
-.rust :not(pre) > .hljs {
-  display: inline-block;
-  vertical-align: middle;
-  padding: 0.1em 0.3em;
-  border-radius: 3px;
-  color: #6e6b5e;
-}
-.rust a:hover > .hljs {
-  text-decoration: underline;
-}
-.rust pre {
-  position: relative;
-}
-.rust pre > .buttons {
-  position: absolute;
-  z-index: 100;
-  right: 5px;
-  top: 5px;
-  color: #c8c9db;
-  cursor: pointer;
-}
-.rust pre > .buttons :hover {
-  color: #e69f67;
-}
-.rust pre > .buttons i {
-  margin-left: 8px;
-}
-.rust pre > .buttons button {
-  color: inherit;
-  background: transparent;
-  border: none;
-  cursor: inherit;
-}
-.rust pre > .result {
-  margin-top: 10px;
-}
-.rust .icon-button {
-  border: none;
-  background: none;
-  padding: 0;
-  color: inherit;
-}
-.rust .icon-button i {
-  margin: 0;
-}
-.rust ::-webkit-scrollbar {
-  background: #e1e1db;
-}
-.rust ::-webkit-scrollbar-thumb {
-  background: #c8c9db;
-}
-.rust #searchbar {
-  border: 1px solid #aaa;
-  border-radius: 3px;
-  background-color: #fafafa;
-  color: #000;
-}
-.rust #searchbar:focus,
-.rust #searchbar.active {
-  -webkit-box-shadow: 0 0 3px #aaa;
-  box-shadow: 0 0 3px #aaa;
-}
-.rust .searchresults-header {
-  color: #666;
-}
-.rust .searchresults-outer {
-  border-bottom: 1px dashed #888;
-}
-.rust ul#searchresults li.focus {
-  background-color: #dec2a2;
-}
-.rust mark {
-  background-color: #e69f67;
-}
-.ayu {
-  color: #c5c5c5;
-  background-color: #0f1419;
-/* Inline code */
-/* Search */
-}
-.ayu .content .header:link,
-.ayu .content .header:visited {
-  color: #c5c5c5;
-}
-.ayu .content .header:link:hover,
-.ayu .content .header:visited:hover {
-  text-decoration: none;
-}
-.ayu .menu-bar {
-  margin: auto -15px;
-}
-.ayu .menu-bar > #menu-bar-sticky-container {
-  background-color: #0f1419;
-  border-bottom-color: #0f1419;
-  border-bottom-width: 1px;
-  border-bottom-style: solid;
-}
-.ayu .menu-bar.bordered > #menu-bar-sticky-container {
-  border-bottom-color: #182028;
-}
-.ayu .sidebar {
-  background-color: #14191f;
-  color: #c8c9db;
-}
-.ayu .sidebar::-webkit-scrollbar {
-  background: #14191f;
-}
-.ayu .sidebar::-webkit-scrollbar-thumb {
-  background: #c8c9db;
-}
-.ayu .chapter li {
-  color: #5c6773;
-}
-.ayu .chapter li a {
-  color: #c8c9db;
-}
-.ayu .chapter li .active,
-.ayu .chapter li a:hover {
-/* Animate color change */
-  color: #ffb454;
-}
-.ayu .chapter .spacer {
-  background-color: #2d334f;
-}
-.ayu .menu-bar,
-.ayu .menu-bar:visited,
-.ayu .nav-chapters,
-.ayu .nav-chapters:visited,
-.ayu .mobile-nav-chapters,
-.ayu .mobile-nav-chapters:visited,
-.ayu .menu-bar .icon-button,
-.ayu .menu-bar a i {
-  color: #737480;
-}
-.ayu .menu-bar i:hover,
-.ayu .menu-bar .icon-button:hover,
-.ayu .nav-chapters:hover,
-.ayu .mobile-nav-chapters i:hover {
-  color: #b7b9cc;
-}
-.ayu .mobile-nav-chapters i:hover {
-  color: #c8c9db;
-}
-.ayu .mobile-nav-chapters {
-  background-color: #14191f;
-}
-.ayu #searchresults a,
-.ayu .content a:link,
-.ayu a:visited,
-.ayu a > .hljs {
-  color: #0096cf;
-}
-.ayu .theme-popup {
-  color: #c5c5c5;
-  background: #14191f;
-  border: 1px solid #5c6773;
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  display: none;
-}
-.ayu .theme-popup .theme:hover {
-  background-color: #191f26;
-}
-.ayu .theme-popup .default {
-  color: #737480;
-}
-.ayu blockquote {
-  margin: 20px 0;
-  padding: 0 20px;
-  color: #c5c5c5;
-  background-color: #262933;
-  border-top: 0.1em solid #2f333f;
-  border-bottom: 0.1em solid #2f333f;
-}
-.ayu table td {
-  border-color: #182028;
-}
-.ayu table tbody tr:nth-child(2n) {
-  background: #141b22;
-}
-.ayu table thead {
-  background: #324354;
-}
-.ayu table thead td {
-  border: none;
-}
-.ayu table thead tr {
-  border: 1px #324354 solid;
-}
-.ayu :not(pre) > .hljs {
-  display: inline-block;
-  vertical-align: middle;
-  padding: 0.1em 0.3em;
-  border-radius: 3px;
-  color: #ffb454;
-}
-.ayu a:hover > .hljs {
-  text-decoration: underline;
-}
-.ayu pre {
-  position: relative;
-}
-.ayu pre > .buttons {
-  position: absolute;
-  z-index: 100;
-  right: 5px;
-  top: 5px;
-  color: #c8c9db;
-  cursor: pointer;
-}
-.ayu pre > .buttons :hover {
-  color: #ffb454;
-}
-.ayu pre > .buttons i {
-  margin-left: 8px;
-}
-.ayu pre > .buttons button {
-  color: inherit;
-  background: transparent;
-  border: none;
-  cursor: inherit;
-}
-.ayu pre > .result {
-  margin-top: 10px;
-}
-.ayu .icon-button {
-  border: none;
-  background: none;
-  padding: 0;
-  color: inherit;
-}
-.ayu .icon-button i {
-  margin: 0;
-}
-.ayu ::-webkit-scrollbar {
-  background: #0f1419;
-}
-.ayu ::-webkit-scrollbar-thumb {
-  background: #c8c9db;
-}
-.ayu #searchbar {
-  border: 1px solid #848484;
-  border-radius: 3px;
-  background-color: #424242;
-  color: #fff;
-}
-.ayu #searchbar:focus,
-.ayu #searchbar.active {
-  -webkit-box-shadow: 0 0 3px #d4c89f;
-  box-shadow: 0 0 3px #d4c89f;
-}
-.ayu .searchresults-header {
-  color: #666;
-}
-.ayu .searchresults-outer {
-  border-bottom: 1px dashed #888;
-}
-.ayu ul#searchresults li.focus {
-  background-color: #252932;
-}
-.ayu mark {
-  background-color: #e3b171;
-}
-@media only print {
-  #sidebar,
-  #menu-bar,
-  .nav-chapters,
-  .mobile-nav-chapters {
-    display: none;
-  }
-  #page-wrapper.page-wrapper {
-    -webkit-transform: none;
-    -moz-transform: none;
-    -o-transform: none;
-    -ms-transform: none;
-    transform: none;
-    margin-left: 0px;
-    overflow-y: initial;
-  }
-  #content {
-    max-width: none;
-    margin: 0;
-    padding: 0;
-  }
-  .page {
-    overflow-y: initial;
-  }
-  code {
-    background-color: #666;
-    border-radius: 5px;
-/* Force background to be printed in Chrome */
-    -webkit-print-color-adjust: exact;
-  }
-  pre > .buttons {
-    z-index: 2;
-  }
-  a,
-  a:visited,
-  a:active,
-  a:hover {
-    color: #4183c4;
-    text-decoration: none;
-  }
-  h1,
-  h2,
-  h3,
-  h4,
-  h5,
-  h6 {
-    page-break-inside: avoid;
-    page-break-after: avoid;
-  }
-  pre,
-  code {
-    page-break-inside: avoid;
-    white-space: pre-wrap;
-  }
-  .fa {
-    display: none !important;
-  }
-}
-.tooltiptext {
-  position: absolute;
-  visibility: hidden;
-  color: #fff;
-  background-color: #333;
-  -webkit-transform: translateX(-50%);
-  -moz-transform: translateX(-50%);
-  -o-transform: translateX(-50%);
-  -ms-transform: translateX(-50%);
-  transform: translateX(-50%); /* Center by moving tooltip 50% of its width left */
-  left: -8px; /* Half of the width of the icon */
-  top: -35px;
-  font-size: 0.8em;
-  text-align: center;
-  border-radius: 6px;
-  padding: 5px 8px;
-  margin: 5px;
-  z-index: 1000;
-}
-.tooltipped .tooltiptext {
-  visibility: visible;
-}
-#searchresults a {
-  text-decoration: none;
-}
-mark {
-  border-radius: 2px;
-  padding: 0 3px 1px 3px;
-  margin: 0 -3px -1px -3px;
-  -webkit-transition: background-color 300ms linear;
-  -moz-transition: background-color 300ms linear;
-  -o-transition: background-color 300ms linear;
-  -ms-transition: background-color 300ms linear;
-  transition: background-color 300ms linear;
-  cursor: pointer;
-}
-mark.fade-out {
-  background-color: rgba(0,0,0,0) !important;
-  cursor: auto;
-}
-.searchbar-outer {
-  margin-left: auto;
-  margin-right: auto;
-  max-width: 750px;
-}
-#searchbar {
-  width: 100%;
-  margin: 5px auto 0px auto;
-  padding: 10px 16px;
-  -webkit-transition: box-shadow 300ms ease-in-out;
-  -moz-transition: box-shadow 300ms ease-in-out;
-  -o-transition: box-shadow 300ms ease-in-out;
-  -ms-transition: box-shadow 300ms ease-in-out;
-  transition: box-shadow 300ms ease-in-out;
-}
-.searchresults-header {
-  font-weight: bold;
-  font-size: 1em;
-  padding: 18px 0 0 5px;
-}
-.searchresults-outer {
-  margin-left: auto;
-  margin-right: auto;
-  max-width: 750px;
-}
-ul#searchresults {
-  list-style: none;
-  padding-left: 20px;
-}
-ul#searchresults li {
-  margin: 10px 0px;
-  padding: 2px;
-  border-radius: 2px;
-}
-ul#searchresults span.teaser {
-  display: block;
-  clear: both;
-  margin: 5px 0 0 20px;
-  font-size: 0.8em;
-}
-ul#searchresults span.teaser em {
-  font-weight: bold;
-  font-style: normal;
-}
diff --git a/src/theme/css/book.css b/src/theme/css/book.css
new file mode 100644
index 00000000..f077bb4f
--- /dev/null
+++ b/src/theme/css/book.css
@@ -0,0 +1,11 @@
+
+@import "general.css";
+@import "sidebar.css";
+@import "page.css";
+@import "menu.css";
+@import "nav-icons.css";
+@import "theme-popup.css";
+@import "themes/base.css";
+@import "print.css";
+@import "tooltip.css";
+@import "searchbar.css";
diff --git a/src/theme/stylus/general.styl b/src/theme/css/general.css
similarity index 53%
rename from src/theme/stylus/general.styl
rename to src/theme/css/general.css
index e40745b6..602288a4 100644
--- a/src/theme/stylus/general.styl
+++ b/src/theme/css/general.css
@@ -1,7 +1,7 @@
 html {
-    font-family: "Open Sans", sans-serif
-    color: #333
-    text-size-adjust: none
+    font-family: "Open Sans", sans-serif;
+    color: #333;
+    text-size-adjust: none;
 }
 
 body {
@@ -12,30 +12,26 @@ body {
 
 code {
     font-family: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace;
-    font-size: 0.875em; // please adjust the ace font size accordingly in editor.js
+    font-size: 0.875em; /* please adjust the ace font size accordingly in editor.js */
 }
 
-.left {
-    float: left
+.left { float: left; }
+
+.right { float: right; }
+
+.hidden { display: none; }
+
+.play-button.hidden { display: none; }
+
+h2, h3 { margin-top: 2.5em; }
+h4, h5 { margin-top: 2em; }
+
+.header + .header h3,
+.header + .header h4,
+.header + .header h5 { 
+    margin-top: 1em;
 }
 
-.right {
-    float: right
-}
-
-.hidden {
-    display: none;
-}
-
-.play-button.hidden {
-    display: none;
-}
-
-h2, h3 { margin-top: 2.5em }
-h4, h5 { margin-top: 2em }
-
-.header + .header h3, .header + .header h4, .header + .header h5 { margin-top: 1em }
-
 a.header:target h1:before,
 a.header:target h2:before,
 a.header:target h3:before,
@@ -49,15 +45,13 @@ a.header:target h4:before {
 table {
     margin: 0 auto;
     border-collapse: collapse;
-
-    td {
-      padding: 3px 20px;
-      border: 1px solid;
-    }
-
-    thead {
-      td { font-weight: 700; }
-    }
+}
+table td {
+    padding: 3px 20px;
+    border: 1px solid;
+}
+table thead td {
+    font-weight: 700; 
 }
 
 :not(.footnote-definition) + .footnote-definition,
@@ -68,6 +62,8 @@ table {
 .footnote-definition {
     font-size: 0.9em;
     margin: 0.5em 0;
-
-    p { display: inline; }
+}
+
+.footnote-definition p {
+    display: inline;
 }
diff --git a/src/theme/css/menu.css b/src/theme/css/menu.css
new file mode 100644
index 00000000..50872e2b
--- /dev/null
+++ b/src/theme/css/menu.css
@@ -0,0 +1,53 @@
+#menu-bar {
+    position: -webkit-sticky;
+    position: sticky;
+    top: 0;
+    z-index: 101;
+}
+#menu-bar > #menu-bar-sticky-container {
+    display: flex;
+    flex-wrap: wrap;
+}
+.js #menu-bar > #menu-bar-sticky-container {
+    transition: transform 0.3s;
+}
+#menu-bar i, #menu-bar .icon-button {
+    position: relative;
+    margin: 0 8px;
+    z-index: 10;
+    line-height: 50px;
+    cursor: pointer;
+    transition: color 0.5s;
+}
+@media only screen and (max-width: var(--narrow-device-max-width)) {
+    #menu-bar i, #menu-bar .icon-button {
+        margin: 0 5px;
+    }
+}
+
+#print-button {
+    margin: 0 15px;
+}
+
+html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-container {
+    transform: translateY(-60px);
+}
+
+.left-buttons { margin: 0 5px; }
+.no-js .left-buttons { display: none; }
+
+.menu-title {
+    display: inline-block;
+    font-weight: 200;
+    font-size: 20px;
+    line-height: 50px;
+    text-align: center;
+    margin: 0;
+    flex: 1;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+.js .menu-title {
+    cursor: pointer;
+}
diff --git a/src/theme/css/nav-icons.css b/src/theme/css/nav-icons.css
new file mode 100644
index 00000000..eb066f98
--- /dev/null
+++ b/src/theme/css/nav-icons.css
@@ -0,0 +1,53 @@
+.nav-chapters {
+    font-size: 2.5em;
+    text-align: center;
+    text-decoration: none;
+
+    position: fixed;
+    top: 50px; /* Height of menu-bar */
+    bottom: 0;
+    margin: 0;
+    max-width: 150px;
+    min-width: 90px;
+
+    display: flex;
+    justify-content: center;
+    align-content: center;
+    flex-direction: column;
+
+    transition: color 0.5s;
+}
+
+.nav-chapters:hover { text-decoration: none; }
+
+.nav-wrapper {
+    margin-top: 50px;
+    display: none;
+}
+
+.mobile-nav-chapters { 
+    font-size: 2.5em;
+    text-align: center;
+    text-decoration: none;
+    width: 90px;
+    border-radius: 5px;
+}
+
+.previous {
+    float: left;
+}
+
+.next {
+    float: right;
+    right: var(--page-padding);
+}
+
+@media only screen and (max-width: var(--page-plus-sidebar-width)) {
+    .nav-wide-wrapper { display: none; }
+    .nav-wrapper { display: block; }
+}
+
+@media only screen and (max-width: var(--page-plus-sidebar-width) + var(--sidebar-width)) {
+    .sidebar-visible .nav-wide-wrapper { display: none; }
+    .sidebar-visible .nav-wrapper { display: block; }
+}
diff --git a/src/theme/css/page.css b/src/theme/css/page.css
new file mode 100644
index 00000000..b4e803ef
--- /dev/null
+++ b/src/theme/css/page.css
@@ -0,0 +1,37 @@
+@import 'variables.css';
+
+.page-wrapper {
+    box-sizing: border-box;
+}
+.js .page-wrapper {
+    transition: margin-left 0.3s ease, transform 0.3s ease; /* Animation: slide away */
+}
+
+.sidebar-visible .page-wrapper {
+    transform: translateX(var(--sidebar-width));
+}
+@media only screen and (min-width: var(--sidebar-reflow-width)) {
+    .sidebar-visible .page-wrapper {
+        transform: none;
+        margin-left: var(--sidebar-width);
+    }
+}
+
+.page {
+    outline: 0;
+    padding: 0 var(--page-padding);
+}
+
+.content {
+    overflow-y: auto;
+    padding: 0 15px;
+    padding-bottom: 50px;
+}
+.content main {
+    margin-left: auto;
+    margin-right: auto;
+    max-width: var(--content-max-width);
+}
+.content a { text-decoration: none; }
+.content a:hover { text-decoration: underline; }
+.content img { max-width: 100%; }
diff --git a/src/theme/stylus/print.styl b/src/theme/css/print.css
similarity index 63%
rename from src/theme/stylus/print.styl
rename to src/theme/css/print.css
index 931af1a4..a82a0859 100644
--- a/src/theme/stylus/print.styl
+++ b/src/theme/css/print.css
@@ -4,7 +4,7 @@
     #menu-bar,
     .nav-chapters,
     .mobile-nav-chapters {
-        display: none
+        display: none;
     }
 
     #page-wrapper.page-wrapper {
@@ -24,11 +24,11 @@
     }
 
     code {
-        background-color: #666666
-        border-radius: 5px
+        background-color: #666666;
+        border-radius: 5px;
 
         /* Force background to be printed in Chrome */
-        -webkit-print-color-adjust: exact
+        -webkit-print-color-adjust: exact;
     }
 
     pre > .buttons {
@@ -36,21 +36,21 @@
     }
 
     a, a:visited, a:active, a:hover {
-        color: #4183c4
-        text-decoration: none
+        color: #4183c4;
+        text-decoration: none;
     }
 
     h1, h2, h3, h4, h5, h6 {
-        page-break-inside: avoid
-        page-break-after: avoid
+        page-break-inside: avoid;
+        page-break-after: avoid;
     }
 
     pre, code {
-        page-break-inside: avoid
-        white-space: pre-wrap
+        page-break-inside: avoid;
+        white-space: pre-wrap;
     }
 
     .fa {
-        display: none !important 
+        display: none !important;
     }
 }
diff --git a/src/theme/stylus/searchbar.styl b/src/theme/css/searchbar.css
similarity index 64%
rename from src/theme/stylus/searchbar.styl
rename to src/theme/css/searchbar.css
index 4d1914ba..c91fd921 100644
--- a/src/theme/stylus/searchbar.styl
+++ b/src/theme/css/searchbar.css
@@ -1,4 +1,4 @@
-@require 'variables'
+@import 'variables.css';
 
 #searchresults a {
     text-decoration: none;
@@ -20,7 +20,7 @@ mark.fade-out {
 .searchbar-outer {
     margin-left: auto;
     margin-right: auto;
-    max-width: $content-max-width;
+    max-width: var(--content-max-width);
 }
 
 #searchbar {
@@ -39,28 +39,25 @@ mark.fade-out {
 .searchresults-outer {
     margin-left: auto;
     margin-right: auto;
-    max-width: $content-max-width;
+    max-width: var(--content-max-width);
 }
 
 ul#searchresults {
     list-style: none;
     padding-left: 20px;
-
-    li {
-        margin: 10px 0px;
-        padding: 2px;
-        border-radius: 2px;
-    }
-
-    span.teaser {
-        display: block;
-        clear: both;
-        margin: 5px 0 0 20px;
-        font-size: 0.8em;
-    }
-
-    span.teaser em {
-        font-weight: bold;
-        font-style: normal;
-    }
+}
+ul#searchresults li {
+    margin: 10px 0px;
+    padding: 2px;
+    border-radius: 2px;
+}
+ul#searchresults span.teaser {
+    display: block;
+    clear: both;
+    margin: 5px 0 0 20px;
+    font-size: 0.8em;
+}
+ul#searchresults span.teaser em {
+    font-weight: bold;
+    font-style: normal;
 }
diff --git a/src/theme/css/sidebar.css b/src/theme/css/sidebar.css
new file mode 100644
index 00000000..99b4e29c
--- /dev/null
+++ b/src/theme/css/sidebar.css
@@ -0,0 +1,53 @@
+@import 'variables.css';
+
+.sidebar {
+    position: fixed;
+    left: 0;
+    top: 0;
+    bottom: 0;
+    width: var(--sidebar-width);
+    overflow-y: auto;
+    padding: 10px 10px;
+    font-size: 0.875em;
+    box-sizing: border-box;
+    -webkit-overflow-scrolling: touch;
+    overscroll-behavior-y: contain;
+}
+.js .sidebar {
+    transition: transform 0.3s; /* Animation: slide away */
+}
+.sidebar code {
+    line-height: 2em;
+}
+.sidebar-hidden .sidebar {
+    transform: translateX(- var(--sidebar-width));
+}
+
+.chapter {
+    list-style: none outside none;
+    padding-left: 0;
+    line-height: 2.2em;
+}
+.chapter li a {
+    display: block;
+    padding: 0;
+    text-decoration: none;
+}
+.chapter li a:hover { text-decoration: none }
+
+.spacer {
+    width: 100%;
+    height: 3px;
+    margin: 5px 0px;
+}
+
+@media (-moz-touch-enabled: 1), (pointer: coarse) { 
+    .chapter li a { padding: 5px 0; }
+    .spacer { margin: 10px 0; }
+}
+
+.section {
+    list-style: none outside none;
+    padding-left: 20px;
+    line-height: 1.9em;
+}
diff --git a/src/theme/css/theme-popup.css b/src/theme/css/theme-popup.css
new file mode 100644
index 00000000..b5425681
--- /dev/null
+++ b/src/theme/css/theme-popup.css
@@ -0,0 +1,25 @@
+.theme-popup {
+    position: absolute;
+    left: 10px;
+    z-index: 1000;
+    border-radius: 4px;
+    font-size: 0.7em;
+}
+.theme-popup .theme {
+    display: inline;
+    border: 0;
+    margin: 0;
+    padding: 2px 10px;
+    line-height: 25px;
+    white-space: nowrap;
+    text-align: left;
+    cursor: pointer;
+    color: inherit;
+    background: inherit;
+    font-size: inherit;
+}
+.theme-popup .theme:hover:first-child,
+.theme-popup .theme:hover:last-child {
+    border-top-left-radius: inherit;
+    border-top-right-radius: inherit;
+}
diff --git a/src/theme/css/themes/ayu.css b/src/theme/css/themes/ayu.css
new file mode 100644
index 00000000..fa88e229
--- /dev/null
+++ b/src/theme/css/themes/ayu.css
@@ -0,0 +1,39 @@
+.ayu {
+    --bg: #0f1419;
+    --fg: #c5c5c5;
+
+    --sidebar-bg: #14191f;
+    --sidebar-fg: #c8c9db;
+    --sidebar-non-existant: #5c6773;
+    --sidebar-active: #ffb454;
+    --sidebar-spacer: #2d334f;
+
+    --scrollbar: var(--sidebar-fg);
+
+    --icons: #737480;
+    --icons-hover: #b7b9cc;
+
+    --links: #0096cf;
+
+    --inline-code-color: #ffb454;
+
+    --theme-popup-bg: #14191f;
+    --theme-popup-border: #5c6773;
+    --theme-hover: #191f26;
+
+    --quote-bg: #262933;
+    --quote-border: lighten(var(--quote-bg), 5%);
+
+    --table-border-color: lighten(var(--bg), 5%);
+    --table-header-bg: lighten(var(--bg), 20%);
+    --table-alternate-bg: lighten(var(--bg), 3%);
+
+    --searchbar-border-color: #848484;
+    --searchbar-bg: #424242;
+    --searchbar-fg: #fff;
+    --searchbar-shadow-color: #d4c89f;
+    --searchresults-header-fg: #666;
+    --searchresults-border-color: #888;
+    --searchresults-li-bg: #252932;
+    --search-mark-bg: #e3b171;
+}
diff --git a/src/theme/css/themes/base.css b/src/theme/css/themes/base.css
new file mode 100644
index 00000000..338761f0
--- /dev/null
+++ b/src/theme/css/themes/base.css
@@ -0,0 +1,233 @@
+
+@import "ayu.css";
+@import "coal.css";
+@import "light.css";
+@import "navy.css";
+@import "rust.css";
+
+* {
+    color: var(--fg);
+    background-color: var(--bg);
+}
+
+.content .header:link,
+.content .header:visited {
+    color: var(--fg);
+}
+
+.content .header:link,
+.content .header:visited:hover {
+    text-decoration: none;
+}
+
+.menu-bar {
+    margin: auto (- var(--page-padding));
+}
+
+.menu-bar > #menu-bar-sticky-container {
+    background-color: var(--bg);
+    border-bottom-color: var(--bg);
+    border-bottom-width: 1px;
+    border-bottom-style: solid;
+}
+
+.menu-bar.bordered > #menu-bar-sticky-container  {
+    border-bottom-color: var(--table-border-color);
+}
+
+.sidebar {
+    background-color: var(--sidebar-bg);
+    color: var(--sidebar-fg);
+}
+
+.sidebar::-webkit-scrollbar {
+    background: var(--sidebar-bg);
+}
+
+.sidebar::-webkit-scrollbar-thumb {
+    background: var(--scrollbar);
+}
+
+.chapter li {
+    color: var(--sidebar-non-existant);
+}
+
+.chapter li a { 
+    color: var(--sidebar-fg); 
+}
+
+.chapter li .active,
+a:hover {
+    /* Animate color change */
+    color: var(--sidebar-active);
+}
+
+.chapter .spacer {
+    background-color: var(--sidebar-spacer);
+}
+
+.menu-bar,
+.menu-bar:visited,
+.nav-chapters,
+.nav-chapters:visited,
+.mobile-nav-chapters,
+.mobile-nav-chapters:visited,
+.menu-bar .icon-button,
+.menu-bar a i {
+    color: var(--icons);
+}
+
+.menu-bar i:hover,
+.menu-bar .icon-button:hover,
+.nav-chapters:hover,
+.mobile-nav-chapters i:hover {
+    color: var(--icons-hover);
+}
+
+.mobile-nav-chapters i:hover {
+    color: var(--sidebar-fg);
+}
+
+.mobile-nav-chapters {
+    background-color: var(--sidebar-bg);
+}
+
+#searchresults a,
+.content a:link,
+a:visited,
+a > .hljs {
+    color: var(--links);
+}
+
+.theme-popup {
+    color: var(--fg);
+    background: var(--theme-popup-bg);
+    border: 1px solid var(--theme-popup-border);
+    margin: 0;
+    padding: 0;
+    list-style: none;
+    display: none;
+}
+.theme-popup .theme:hover {
+    background-color: var(--theme-hover);
+}
+.theme-popup .default {
+    color: var(--icons);
+}
+
+blockquote {
+    margin: 20px 0;
+    padding: 0 20px;
+    color: var(--fg);
+    background-color: var(--quote-bg);
+    border-top: .1em solid var(--quote-border);
+    border-bottom: .1em solid var(--quote-border);
+}
+
+
+table td {
+    border-color: var(--table-border-color);
+}
+
+/* Alternate background colors for rows */
+table tbody tr:nth-child(2n) {
+    background: var(--table-alternate-bg);
+}
+table thead {
+    background: var(--table-header-bg);
+}
+table thead td {
+    border: none;
+}
+table thead tr {
+    border: 1px var(--table-header-bg) solid;
+}
+
+
+/* Inline code */
+:not(pre) > .hljs {
+    display: inline-block;
+    vertical-align: middle;
+    padding: 0.1em 0.3em;
+    border-radius: 3px;
+    color: var(--inline-code-color);
+}
+
+a:hover > .hljs {
+    text-decoration: underline;
+}
+
+pre {
+    position: relative;
+}
+pre > .buttons {
+    position: absolute;
+    z-index: 100;
+    right: 5px;
+    top: 5px;
+
+    color: var(--sidebar-fg);
+    cursor: pointer;
+}
+pre > .buttons :hover {
+    color: var(--sidebar-active);
+}
+pre > .buttons i {
+    margin-left: 8px;
+}
+pre > .buttons button {
+    color: inherit;
+    background: transparent;
+    border: none;
+    cursor: inherit;
+}
+pre > .result {
+    margin-top: 10px;
+}
+
+.icon-button {
+    border: none;
+    background: none;
+    padding: 0;
+    color: inherit;
+}
+.icon-button i {
+    margin: 0;
+}
+
+::-webkit-scrollbar {
+    background: var(--bg);
+}
+
+::-webkit-scrollbar-thumb {
+    background: var(--scrollbar);
+}
+
+/* Search */
+#searchbar {
+    border: 1px solid var(--searchbar-border-color);
+    border-radius: 3px;
+    background-color: var(--searchbar-bg);
+    color: var(--searchbar-fg);
+}
+
+#searchbar:focus,
+#searchbar.active {
+    box-shadow: 0 0 3px var(--searchbar-shadow-color);
+}
+
+.searchresults-header {
+    color: var(--searchresults-header-fg);
+}
+
+.searchresults-outer {
+    border-bottom: 1px dashed var(--searchresults-border-color);
+}
+
+ul#searchresults li.focus {
+    background-color: var(--searchresults-li-bg);
+}
+
+mark {
+    background-color: var(--search-mark-bg);
+}
\ No newline at end of file
diff --git a/src/theme/css/themes/coal.css b/src/theme/css/themes/coal.css
new file mode 100644
index 00000000..f826a789
--- /dev/null
+++ b/src/theme/css/themes/coal.css
@@ -0,0 +1,39 @@
+.coal {
+    --bg: #141617;
+    --fg: #98a3ad;
+
+    --sidebar-bg: #292c2f;
+    --sidebar-fg: #a1adb8;
+    --sidebar-non-existant: #505254;
+    --sidebar-active: #3473ad;
+    --sidebar-spacer: #393939;
+
+    --scrollbar: var(--sidebar-fg);
+
+    --icons: #43484d;
+    --icons-hover: #b3c0cc;
+
+    --links: #2b79a2;
+
+    --inline-code-color: #c5c8c6;;
+
+    --theme-popup-bg: #141617;
+    --theme-popup-border: #43484d;
+    --theme-hover: #1f2124;
+
+    --quote-bg: #242637;
+    --quote-border: lighten(var(--quote-bg), 5%);
+
+    --table-border-color: lighten(var(--bg), 5%);
+    --table-header-bg: lighten(var(--bg), 20%);
+    --table-alternate-bg: lighten(var(--bg), 3%);
+
+    --searchbar-border-color: #aaa;
+    --searchbar-bg: #b7b7b7;
+    --searchbar-fg: #000;
+    --searchbar-shadow-color: #aaa;
+    --searchresults-header-fg: #666;
+    --searchresults-border-color: #98a3ad;
+    --searchresults-li-bg: #2b2b2f;
+    --search-mark-bg: #355c7d;
+}
diff --git a/src/theme/css/themes/light.css b/src/theme/css/themes/light.css
new file mode 100644
index 00000000..6eb257df
--- /dev/null
+++ b/src/theme/css/themes/light.css
@@ -0,0 +1,39 @@
+.light {
+    --bg: #ffffff;
+    --fg: #333333;
+
+    --sidebar-bg: #fafafa;
+    --sidebar-fg: #364149;
+    --sidebar-non-existant: #aaaaaa;
+    --sidebar-active: #008cff;
+    --sidebar-spacer: #f4f4f4;
+
+    --scrollbar: #cccccc;
+
+    --icons: #cccccc;
+    --icons-hover: #333333;
+
+    --links: #4183c4;
+
+    --inline-code-color: #6e6b5e;
+
+    --theme-popup-bg: #fafafa;
+    --theme-popup-border: #cccccc;
+    --theme-hover: #e6e6e6;
+
+    --quote-bg: #f2f7f9;
+    --quote-border: darken(var(--quote-bg), 5%);
+
+    --table-border-color: darken(var(--bg), 5%);
+    --table-header-bg: darken(var(--bg), 20%);
+    --table-alternate-bg: darken(var(--bg), 3%);
+
+    --searchbar-border-color: #aaa;
+    --searchbar-bg: #fafafa;
+    --searchbar-fg: #000;
+    --searchbar-shadow-color: #aaa;
+    --searchresults-header-fg: #666;
+    --searchresults-border-color: #888;
+    --searchresults-li-bg: #e4f2fe;
+    --search-mark-bg: #a2cff5;
+}
diff --git a/src/theme/css/themes/navy.css b/src/theme/css/themes/navy.css
new file mode 100644
index 00000000..7e6c165f
--- /dev/null
+++ b/src/theme/css/themes/navy.css
@@ -0,0 +1,40 @@
+
+.navy {
+    --bg: #161923;
+    --fg: #bcbdd0;
+
+    --sidebar-bg: #282d3f;
+    --sidebar-fg: #c8c9db;
+    --sidebar-non-existant: #505274;
+    --sidebar-active: #2b79a2;
+    --sidebar-spacer: #2d334f;
+
+    --scrollbar: var(--sidebar-fg);
+
+    --icons: #737480;
+    --icons-hover: #b7b9cc;
+
+    --links: #2b79a2;
+
+    --inline-code-color: #c5c8c6;;
+
+    --theme-popup-bg: #161923;
+    --theme-popup-border: #737480;
+    --theme-hover: #282e40;
+
+    --quote-bg: #262933;
+    --quote-border: lighten(var(--quote-bg), 5%);
+
+    --table-border-color: lighten(var(--bg), 5%);
+    --table-header-bg: lighten(var(--bg), 20%);
+    --table-alternate-bg: lighten(var(--bg), 3%);
+
+    --searchbar-border-color: #aaa;
+    --searchbar-bg: #aeaec6;
+    --searchbar-fg: #000;
+    --searchbar-shadow-color: #aaa;
+    --searchresults-header-fg: #5f5f71;
+    --searchresults-border-color: #5c5c68;
+    --searchresults-li-bg: #242430;
+    --search-mark-bg: #a2cff5;
+}
diff --git a/src/theme/css/themes/rust.css b/src/theme/css/themes/rust.css
new file mode 100644
index 00000000..adc801cd
--- /dev/null
+++ b/src/theme/css/themes/rust.css
@@ -0,0 +1,40 @@
+
+.rust {
+    --bg: #e1e1db;
+    --fg: #262625;
+
+    --sidebar-bg: #3b2e2a;
+    --sidebar-fg: #c8c9db;
+    --sidebar-non-existant: #505254;
+    --sidebar-active: #e69f67;
+    --sidebar-spacer: #45373a;
+
+    --scrollbar: var(--sidebar-fg);
+
+    --icons: #737480;
+    --icons-hover: #262625;
+
+    --links: #2b79a2;
+
+    --inline-code-color: #6e6b5e;
+
+    --theme-popup-bg: #e1e1db;
+    --theme-popup-border: #b38f6b;
+    --theme-hover: #99908a;
+
+    --quote-bg: #c1c1bb;
+    --quote-border: darken(var(--quote-bg), 5%);
+
+    --table-border-color: darken(var(--bg), 5%);
+    --table-header-bg: #b3a497;
+    --table-alternate-bg: darken(var(--bg), 3%);
+
+    --searchbar-border-color: #aaa;
+    --searchbar-bg: #fafafa;
+    --searchbar-fg: #000;
+    --searchbar-shadow-color: #aaa;
+    --searchresults-header-fg: #666;
+    --searchresults-border-color: #888;
+    --searchresults-li-bg: #dec2a2;
+    --search-mark-bg: #e69f67;
+}
diff --git a/src/theme/stylus/tooltip.styl b/src/theme/css/tooltip.css
similarity index 100%
rename from src/theme/stylus/tooltip.styl
rename to src/theme/css/tooltip.css
diff --git a/src/theme/css/variables.css b/src/theme/css/variables.css
new file mode 100644
index 00000000..8089fad8
--- /dev/null
+++ b/src/theme/css/variables.css
@@ -0,0 +1,10 @@
+
+:root {
+    --sidebar-width: 300px;
+    --page-padding: 15px;
+    --content-max-width: 750px;
+    --content-min-width: 320px;
+    --page-plus-sidebar-width: var(--content-max-width) + var(--sidebar-width) + var(--page-padding) * 2;
+    --sidebar-reflow-width: var(--sidebar-width) + var(--content-min-width);
+    --narrow-device-max-width: 420px;
+}
diff --git a/src/theme/stylus/book.styl b/src/theme/stylus/book.styl
deleted file mode 100644
index a9eec8ad..00000000
--- a/src/theme/stylus/book.styl
+++ /dev/null
@@ -1,12 +0,0 @@
-@import "nib"
-
-@import 'general'
-@import 'sidebar'
-@import 'page'
-@import 'menu'
-@import 'nav-icons'
-@import 'theme-popup'
-@import 'themes'
-@import 'print'
-@import 'tooltip'
-@import 'searchbar'
diff --git a/src/theme/stylus/menu.styl b/src/theme/stylus/menu.styl
deleted file mode 100644
index 66d0c07f..00000000
--- a/src/theme/stylus/menu.styl
+++ /dev/null
@@ -1,55 +0,0 @@
-#menu-bar {
-    position: -webkit-sticky
-    position: sticky
-    top: 0
-    z-index: 101
-
-    & > #menu-bar-sticky-container {
-        display: flex
-        flex-wrap: wrap
-        .js & {
-            transition: transform 0.3s
-        }
-    }
-
-    i, .icon-button {
-        position: relative
-        margin: 0 8px
-        @media only screen and (max-width: $narrow-device-max-width) {
-            margin: 0 5px
-        }
-        z-index: 10
-        line-height: 50px
-        cursor: pointer
-        transition: color 0.5s
-    }
-
-    #print-button {
-        margin: 0 15px
-    }
-}
-
-html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-container {
-    transform: translateY(-60px);
-}
-
-.left-buttons {
-    .no-js & { display: none }
-    margin: 0 5px
-}
-
-.menu-title {
-    display: inline-block
-    font-weight: 200
-    font-size: 20px
-    line-height: 50px
-    text-align: center
-    margin: 0
-    flex: 1
-    white-space: nowrap
-    overflow: hidden
-    text-overflow: ellipsis
-    .js & {
-        cursor: pointer
-    }
-}
diff --git a/src/theme/stylus/nav-icons.styl b/src/theme/stylus/nav-icons.styl
deleted file mode 100644
index 5d967a54..00000000
--- a/src/theme/stylus/nav-icons.styl
+++ /dev/null
@@ -1,55 +0,0 @@
-.nav-chapters {
-    font-size: 2.5em
-    text-align: center
-    text-decoration: none
-
-    position: fixed
-    top: 50px /* Height of menu-bar */
-    bottom: 0
-    margin: 0
-    max-width: 150px
-    min-width: 90px
-
-    display: flex
-    justify-content: center
-    align-content: center
-    flex-direction: column
-
-    transition: color 0.5s
-}
-
-.nav-chapters:hover { text-decoration: none }
-
-.nav-wrapper {
-    margin-top: 50px
-    display: none
-}
-
-.mobile-nav-chapters { 
-    font-size: 2.5em
-    text-align: center
-    text-decoration: none
-    width: 90px
-    border-radius: 5px
-}
-
-.previous {
-    float: left
-}
-
-.next {
-    float: right
-    right: $page-padding 
-}
-
-@media only screen and (max-width: $page-plus-sidebar-width) {
-    .nav-wide-wrapper { display: none }
-    .nav-wrapper { display: block }
-}
-
-@media only screen and (max-width: $page-plus-sidebar-width + $sidebar-width) {
-    .sidebar-visible {
-        .nav-wide-wrapper { display: none }
-        .nav-wrapper { display: block }
-    }
-}
diff --git a/src/theme/stylus/page.styl b/src/theme/stylus/page.styl
deleted file mode 100644
index d0276df8..00000000
--- a/src/theme/stylus/page.styl
+++ /dev/null
@@ -1,43 +0,0 @@
-@require 'variables'
-
-.page-wrapper {
-    box-sizing: border-box
-
-    // Animation: slide away
-    .js & {
-        transition: margin-left 0.3s ease, transform 0.3s ease
-    }
-}
-
-.sidebar-visible .page-wrapper {
-    transform: translateX($sidebar-width)
-
-    @media only screen and (min-width: $sidebar-reflow-width) {
-        transform: none
-        margin-left: $sidebar-width
-    }
-}
-
-.page {
-    outline: 0
-    padding: 0 $page-padding
-}
-
-.content {
-    overflow-y: auto
-    padding: 0 15px
-    padding-bottom: 50px
-
-    main {
-        margin-left: auto
-        margin-right: auto
-        max-width: $content-max-width
-    }
-
-    a {
-        text-decoration: none;
-        &:hover { text-decoration: underline; }
-    }
-
-    img { max-width: 100%; }
-}
diff --git a/src/theme/stylus/sidebar.styl b/src/theme/stylus/sidebar.styl
deleted file mode 100644
index 5d30d8b8..00000000
--- a/src/theme/stylus/sidebar.styl
+++ /dev/null
@@ -1,56 +0,0 @@
-@require 'variables'
-
-.sidebar {
-    position: fixed
-    left: 0
-    top: 0
-    bottom: 0
-    width: $sidebar-width
-    overflow-y: auto
-    padding: 10px 10px
-    font-size: 0.875em
-    box-sizing: border-box
-    -webkit-overflow-scrolling: touch
-    overscroll-behavior-y: contain;
-
-    // Animation: slide away
-    .js & {
-        transition: transform 0.3s
-    }
-
-    code {
-        line-height: 2em;
-    }
-}
-
-.sidebar-hidden .sidebar {
-    transform: translateX(- $sidebar-width)
-}
-
-.chapter {
-    list-style: none outside none
-    padding-left: 0
-    line-height: 2.2em
-
-    li a {
-        display: block;
-        padding: 0
-        text-decoration: none
-
-        @media (-moz-touch-enabled: 1), (pointer: coarse) { padding: 5px 0; }
-        &:hover { text-decoration: none }
-    }
-
-    .spacer {
-        width: 100%
-        height: 3px
-        margin: 5px 0px
-        @media (-moz-touch-enabled: 1), (pointer: coarse) { margin: 10px 0; }
-    }
-}
-
-.section {
-    list-style: none outside none
-    padding-left: 20px
-    line-height: 1.9em
-}
diff --git a/src/theme/stylus/theme-popup.styl b/src/theme/stylus/theme-popup.styl
deleted file mode 100644
index b0c956e6..00000000
--- a/src/theme/stylus/theme-popup.styl
+++ /dev/null
@@ -1,31 +0,0 @@
-.theme-popup {
-    position: absolute
-    left: 10px
-
-    z-index: 1000;
-
-    border-radius: 4px
-    font-size: 0.7em
-
-    .theme {
-        display: inline
-        border: 0
-        margin: 0
-        padding: 2px 10px
-        line-height: 25px
-        width: 100%
-        white-space: nowrap
-        text-align: left
-        cursor: pointer
-        color inherit
-        background: inherit;
-        font-size: inherit;
-
-        &:hover:first-child,
-        &:hover:last-child {
-            border-top-left-radius: inherit;
-            border-top-right-radius: inherit;
-        }
-    }
-
-}
\ No newline at end of file
diff --git a/src/theme/stylus/themes/ayu.styl b/src/theme/stylus/themes/ayu.styl
deleted file mode 100644
index 1c19ff67..00000000
--- a/src/theme/stylus/themes/ayu.styl
+++ /dev/null
@@ -1,41 +0,0 @@
-$theme-name = 'ayu'
-
-$bg = #0f1419
-$fg = #c5c5c5
-
-$sidebar-bg = #14191f
-$sidebar-fg = #c8c9db
-$sidebar-non-existant = #5c6773
-$sidebar-active = #ffb454
-$sidebar-spacer = #2d334f
-
-$scrollbar = $sidebar-fg
-
-$icons = #737480
-$icons-hover = #b7b9cc
-
-$links = #0096cf
-
-$inline-code-color = #ffb454
-
-$theme-popup-bg = #14191f
-$theme-popup-border = #5c6773
-$theme-hover = #191f26
-
-$quote-bg = #262933
-$quote-border = lighten($quote-bg, 5%)
-
-$table-border-color = lighten($bg, 5%)
-$table-header-bg = lighten($bg, 20%)
-$table-alternate-bg = lighten($bg, 3%)
-
-$searchbar-border-color = #848484
-$searchbar-bg = #424242
-$searchbar-fg = #fff
-$searchbar-shadow-color = #d4c89f
-$searchresults-header-fg = #666
-$searchresults-border-color = #888
-$searchresults-li-bg = #252932
-$search-mark-bg = #e3b171
-
-@import 'base'
diff --git a/src/theme/stylus/themes/base.styl b/src/theme/stylus/themes/base.styl
deleted file mode 100644
index 939572fc..00000000
--- a/src/theme/stylus/themes/base.styl
+++ /dev/null
@@ -1,221 +0,0 @@
-.{unquote($theme-name)} {
-
-    color: $fg
-    background-color: $bg
-
-    .content .header:link, .content .header:visited {
-        color: $fg;
-
-        &:hover {
-            text-decoration: none;
-        }
-    }
-
-    .menu-bar {
-        margin: auto (- $page-padding);
-
-        & > #menu-bar-sticky-container {
-            background-color: $bg
-            border-bottom-color: $bg
-            border-bottom-width: 1px
-            border-bottom-style: solid
-        }
-
-        &.bordered > #menu-bar-sticky-container  {
-            border-bottom-color: $table-border-color
-        }
-    }
-
-    $table-border-color
-
-    .sidebar {
-        background-color: $sidebar-bg
-        color: $sidebar-fg
-
-        &::-webkit-scrollbar {
-            background: $sidebar-bg;
-        }
-
-        &::-webkit-scrollbar-thumb {
-            background: $scrollbar;
-        }
-    }
-
-    .chapter li {
-        color: $sidebar-non-existant
-
-        a { color: $sidebar-fg }
-
-        .active,
-         a:hover, {
-            /* Animate color change */
-            color: $sidebar-active
-        }
-    }
-
-    .chapter .spacer {
-        background-color: $sidebar-spacer
-    }
-
-    .menu-bar,
-    .menu-bar:visited,
-    .nav-chapters,
-    .nav-chapters:visited,
-    .mobile-nav-chapters,
-    .mobile-nav-chapters:visited,
-    .menu-bar .icon-button,
-    .menu-bar a i {
-        color: $icons
-    }
-
-    .menu-bar i:hover,
-    .menu-bar .icon-button:hover,
-    .nav-chapters:hover,
-    .mobile-nav-chapters i:hover {
-        color: $icons-hover
-    }
-
-    .mobile-nav-chapters i:hover {
-        color: $sidebar-fg
-    }
-
-    .mobile-nav-chapters {
-        background-color: $sidebar-bg
-    }
-
-    #searchresults a,
-    .content a:link,
-    a:visited,
-    a > .hljs {
-        color: $links
-    }
-
-    .theme-popup {
-        color: $fg
-        background: $theme-popup-bg
-        border: 1px solid $theme-popup-border
-        margin: 0;
-        padding: 0;
-        list-style: none;
-        display: none;
-
-        .theme:hover { background-color: $theme-hover }
-
-        .default { color: $icons }
-    }
-
-    blockquote {
-        margin: 20px 0;
-        padding: 0 20px;
-        color: $fg;
-        background-color: $quote-bg;
-        border-top: .1em solid $quote-border;
-        border-bottom: .1em solid $quote-border;
-    }
-
-
-    table {
-
-        td {
-            border-color: $table-border-color;
-        }
-
-        // Alternate background colors for rows
-        tbody tr:nth-child(2n) {
-            background: $table-alternate-bg;
-        }
-
-        thead {
-            background: $table-header-bg;
-            td { border: none; }
-            tr { border: 1px $table-header-bg solid; }
-        }
-    }
-
-
-    /* Inline code */
-    :not(pre) > .hljs {
-        display: inline-block;
-        vertical-align: middle;
-        padding: 0.1em 0.3em;
-        border-radius: 3px;
-        color: $inline-code-color;
-    }
-
-    a:hover > .hljs {
-        text-decoration: underline;
-    }
-
-    pre {
-        position: relative;
-
-        & > .buttons {
-            position: absolute;
-            z-index: 100;
-            right: 5px;
-            top: 5px;
-
-            color: $sidebar-fg;
-            cursor: pointer;
-
-            :hover { color: $sidebar-active; }
-            i { margin-left: 8px; }
-            button {
-                color: inherit;
-                background: transparent;
-                border: none;
-                cursor: inherit;
-            }
-        }
-
-        & > .result { margin-top: 10px; }
-
-    }
-
-    .icon-button {
-        border: none;
-        background: none;
-        padding: 0;
-        color: inherit;
-
-        i {
-            margin: 0;
-        }
-    }
-
-    ::-webkit-scrollbar {
-        background: $bg;
-    }
-
-    ::-webkit-scrollbar-thumb {
-        background: $scrollbar;
-    }
-
-    /* Search */
-    #searchbar {
-        border: 1px solid $searchbar-border-color;
-        border-radius: 3px;
-        background-color: $searchbar-bg;
-        color: $searchbar-fg
-
-        &:focus, &.active {
-            box-shadow: 0 0 3px $searchbar-shadow-color;
-        }
-    }
-
-    .searchresults-header {
-        color: $searchresults-header-fg;
-    }
-
-    .searchresults-outer {
-        border-bottom: 1px dashed $searchresults-border-color;
-    }
-
-    ul#searchresults li.focus {
-        background-color: $searchresults-li-bg;
-    }
-
-    mark {
-        background-color: $search-mark-bg;
-    }
-}
diff --git a/src/theme/stylus/themes/coal.styl b/src/theme/stylus/themes/coal.styl
deleted file mode 100644
index 4f9364ea..00000000
--- a/src/theme/stylus/themes/coal.styl
+++ /dev/null
@@ -1,41 +0,0 @@
-$theme-name = 'coal'
-
-$bg = #141617
-$fg = #98a3ad
-
-$sidebar-bg = #292c2f
-$sidebar-fg = #a1adb8
-$sidebar-non-existant = #505254
-$sidebar-active = #3473ad
-$sidebar-spacer = #393939
-
-$scrollbar = $sidebar-fg
-
-$icons = #43484d
-$icons-hover = #b3c0cc
-
-$links = #2b79a2
-
-$inline-code-color = #c5c8c6;
-
-$theme-popup-bg = #141617
-$theme-popup-border = #43484d
-$theme-hover = #1f2124
-
-$quote-bg = #242637
-$quote-border = lighten($quote-bg, 5%)
-
-$table-border-color = lighten($bg, 5%)
-$table-header-bg = lighten($bg, 20%)
-$table-alternate-bg = lighten($bg, 3%)
-
-$searchbar-border-color = #aaa
-$searchbar-bg = #b7b7b7
-$searchbar-fg = #000
-$searchbar-shadow-color = #aaa
-$searchresults-header-fg = #666
-$searchresults-border-color = #98a3ad
-$searchresults-li-bg = #2b2b2f
-$search-mark-bg = #355c7d
-
-@import 'base'
diff --git a/src/theme/stylus/themes/index.styl b/src/theme/stylus/themes/index.styl
deleted file mode 100644
index be06b6fc..00000000
--- a/src/theme/stylus/themes/index.styl
+++ /dev/null
@@ -1,5 +0,0 @@
-@import 'light'
-@import 'coal'
-@import 'navy'
-@import 'rust'
-@import 'ayu'
diff --git a/src/theme/stylus/themes/light.styl b/src/theme/stylus/themes/light.styl
deleted file mode 100644
index d2b77e21..00000000
--- a/src/theme/stylus/themes/light.styl
+++ /dev/null
@@ -1,41 +0,0 @@
-$theme-name = 'light'
-
-$bg = #ffffff
-$fg = #333333
-
-$sidebar-bg = #fafafa
-$sidebar-fg = #364149
-$sidebar-non-existant = #aaaaaa
-$sidebar-active = #008cff
-$sidebar-spacer = #f4f4f4
-
-$scrollbar = #cccccc
-
-$icons = #cccccc
-$icons-hover = #333333
-
-$links = #4183c4
-
-$inline-code-color = #6e6b5e
-
-$theme-popup-bg = #fafafa
-$theme-popup-border = #cccccc
-$theme-hover = #e6e6e6
-
-$quote-bg = #f2f7f9
-$quote-border = darken($quote-bg, 5%)
-
-$table-border-color = darken($bg, 5%)
-$table-header-bg = darken($bg, 20%)
-$table-alternate-bg = darken($bg, 3%)
-
-$searchbar-border-color = #aaa
-$searchbar-bg = #fafafa
-$searchbar-fg = #000
-$searchbar-shadow-color = #aaa
-$searchresults-header-fg = #666
-$searchresults-border-color = #888
-$searchresults-li-bg = #e4f2fe
-$search-mark-bg = #a2cff5
-
-@import 'base'
diff --git a/src/theme/stylus/themes/navy.styl b/src/theme/stylus/themes/navy.styl
deleted file mode 100644
index d4c038af..00000000
--- a/src/theme/stylus/themes/navy.styl
+++ /dev/null
@@ -1,41 +0,0 @@
-$theme-name = 'navy'
-
-$bg = #161923
-$fg = #bcbdd0
-
-$sidebar-bg = #282d3f
-$sidebar-fg = #c8c9db
-$sidebar-non-existant = #505274
-$sidebar-active = #2b79a2
-$sidebar-spacer = #2d334f
-
-$scrollbar = $sidebar-fg
-
-$icons = #737480
-$icons-hover = #b7b9cc
-
-$links = #2b79a2
-
-$inline-code-color = #c5c8c6;
-
-$theme-popup-bg = #161923
-$theme-popup-border = #737480
-$theme-hover = #282e40
-
-$quote-bg = #262933
-$quote-border = lighten($quote-bg, 5%)
-
-$table-border-color = lighten($bg, 5%)
-$table-header-bg = lighten($bg, 20%)
-$table-alternate-bg = lighten($bg, 3%)
-
-$searchbar-border-color = #aaa
-$searchbar-bg = #aeaec6
-$searchbar-fg = #000
-$searchbar-shadow-color = #aaa
-$searchresults-header-fg = #5f5f71
-$searchresults-border-color = #5c5c68
-$searchresults-li-bg = #242430
-$search-mark-bg = #a2cff5
-
-@import 'base'
diff --git a/src/theme/stylus/themes/rust.styl b/src/theme/stylus/themes/rust.styl
deleted file mode 100644
index c5a2eb8f..00000000
--- a/src/theme/stylus/themes/rust.styl
+++ /dev/null
@@ -1,41 +0,0 @@
-$theme-name = 'rust'
-
-$bg = #e1e1db
-$fg = #262625
-
-$sidebar-bg = #3b2e2a
-$sidebar-fg = #c8c9db
-$sidebar-non-existant = #505254
-$sidebar-active = #e69f67
-$sidebar-spacer = #45373a
-
-$scrollbar = $sidebar-fg
-
-$icons = #737480
-$icons-hover = #262625
-
-$links = #2b79a2
-
-$inline-code-color = #6e6b5e;
-
-$theme-popup-bg = #e1e1db
-$theme-popup-border = #b38f6b
-$theme-hover = #99908a
-
-$quote-bg = #c1c1bb
-$quote-border = darken($quote-bg, 5%)
-
-$table-border-color = darken($bg, 5%)
-$table-header-bg = #b3a497
-$table-alternate-bg = darken($bg, 3%)
-
-$searchbar-border-color = #aaa
-$searchbar-bg = #fafafa
-$searchbar-fg = #000
-$searchbar-shadow-color = #aaa
-$searchresults-header-fg = #666
-$searchresults-border-color = #888
-$searchresults-li-bg = #dec2a2
-$search-mark-bg = #e69f67
-
-@import 'base'
diff --git a/src/theme/stylus/variables.styl b/src/theme/stylus/variables.styl
deleted file mode 100644
index 6ffbb73b..00000000
--- a/src/theme/stylus/variables.styl
+++ /dev/null
@@ -1,7 +0,0 @@
-$sidebar-width = 300px
-$page-padding = 15px
-$content-max-width = 750px
-$content-min-width = 320px
-$page-plus-sidebar-width = $content-max-width + $sidebar-width + $page-padding * 2
-$sidebar-reflow-width = $sidebar-width + $content-min-width
-$narrow-device-max-width = 420px