diff --git a/app/assets/stylesheets/highlight/dark.scss b/app/assets/stylesheets/highlight/dark.scss
index 02c5d72621..a56c98cc5f 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 4e039d9434..c9709fa7f1 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 a58918519a..cc82f39ac9 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 04989f7dfb..df127a7c49 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;
   }