diff --git a/app/assets/stylesheets/highlight/dark.scss b/app/assets/stylesheets/highlight/dark.scss
index 02c5d72621c1e6f83a9c8a4165d321d605630405..a56c98cc5f1ec5f44829c585dad4dddce1a045ac 100644
--- a/app/assets/stylesheets/highlight/dark.scss
+++ b/app/assets/stylesheets/highlight/dark.scss
@@ -3,6 +3,7 @@
   background-color: #333;
 
   pre {
+    background-color: #333;
     color: #eee;
   }
 
diff --git a/app/assets/stylesheets/highlight/monokai.scss b/app/assets/stylesheets/highlight/monokai.scss
index 4e039d94348c5239f5328ce72df841a19565a300..c9709fa7f123fa25eafac235e6127fb88a6aa841 100644
--- a/app/assets/stylesheets/highlight/monokai.scss
+++ b/app/assets/stylesheets/highlight/monokai.scss
@@ -12,6 +12,7 @@ $monokai-purple: #ae81ff;
   background-color: #272822;
 
   pre {
+    background-color: #272822;
     color: $monokai-fg;
   }
 
diff --git a/app/assets/stylesheets/highlight/solarized_dark.scss b/app/assets/stylesheets/highlight/solarized_dark.scss
index a58918519a37e4ecfc28ab5df4a1132417ac0101..cc82f39ac93472ba4a79eee345b6b71e43b66c58 100644
--- a/app/assets/stylesheets/highlight/solarized_dark.scss
+++ b/app/assets/stylesheets/highlight/solarized_dark.scss
@@ -3,6 +3,7 @@
   background-color: #002B36;
   
   pre {
+    background-color: #002B36;
     color: #eee;
   }
 
diff --git a/app/assets/stylesheets/highlight/white.scss b/app/assets/stylesheets/highlight/white.scss
index 04989f7dfb48aa603b22d640ca502004a3e2be96..df127a7c49180ac494768fc908cb09f097ede716 100644
--- a/app/assets/stylesheets/highlight/white.scss
+++ b/app/assets/stylesheets/highlight/white.scss
@@ -3,6 +3,7 @@
   background-color: #fff;
   
   pre {
+    background-color: #fff;
     color: #333;
   }