diff --git a/css/main.css b/css/main.css
index 914987b..46a0592 100644
--- a/css/main.css
+++ b/css/main.css
@@ -606,6 +606,7 @@ code table, code table td, code table th, code table tbody, code table tr,
 td.gutter pre {
   padding: 0;
   border: none;
+  background-color: #fff;
 }
 .highlight > pre {
   padding: 0;