diff --git a/src/theme/css/general.css b/src/theme/css/general.css
index 4ad80dd4..2ab93c8c 100644
--- a/src/theme/css/general.css
+++ b/src/theme/css/general.css
@@ -148,6 +148,12 @@ blockquote, details {
     border-bottom: .1em solid var(--quote-border);
 }
 
+details {
+    border-left: .1em solid var(--quote-border);
+    border-right: .1em solid var(--quote-border);
+    border-radius: 4px;
+}
+
 kbd {
     background-color: var(--table-border-color);
     border-radius: 4px;