diff --git a/boards/static/css/md/base_page.css b/boards/static/css/md/base_page.css
--- a/boards/static/css/md/base_page.css
+++ b/boards/static/css/md/base_page.css
@@ -416,7 +416,15 @@ ul {
     padding-left: 0px;
 }
 
+/* Reflink preview */
 .post_preview {
     border-left: 1px solid #777;
     border-right: 1px solid #777;
 }
+
+/* Code highlighter */
+.hljs {
+    color: #fff;
+    background: #000;
+    display: inline-block;
+}