diff --git a/dist/css/index.css b/dist/css/index.css
index 0d58b9d..056aad7 100644
--- a/dist/css/index.css
+++ b/dist/css/index.css
@@ -13,6 +13,11 @@ a {
 pre {
   max-width: 100%;
   overflow: hidden;
+  background: #ededed;
+  padding-top: 5px;
+  padding-bottom: 5px;
+  padding-left: 10px;
+  border-left: 5px solid #999;
 }
 
 ul li {