Added basic print support in the stylesheet. Forced background color for code blocks in chrome, has to be tested in firefox and others. #41

src/theme/book.css

@@ -3,7 +3,7 @@ html, body {
     color: #333;
 }
 
-
+@media only screen {
     .sidebar {
         position: absolute;
         left: 0;
@@ -210,6 +210,7 @@ html, body {
     .next {
         right: 0;
     }
+}
 
 
 @media only screen and (max-width: 1060px) {
@@ -258,3 +259,30 @@ html, body {
         float: left;
     }
 }
+
+@media only print {
+    .sidebar, .menu-bar, .nav-chapters, .mobile-nav-chapters {
+      display: none;
+    }
+
+    .page-wrapper {
+      left: 0;
+    }
+
+    .content {
+      max-width: 100%;
+    }
+
+    code {
+      background-color: #666666;
+      border-radius: 5px;
+
+      /* Force background to be printed in Chrome */
+      -webkit-print-color-adjust: exact;
+    }
+
+    a, a:visited, a:active, a:hover {
+      color: #4183c4;
+      text-decoration: none;
+    }
+}