diff --git a/stylesheets/screen.css b/stylesheets/screen.css
index 75078ac..dea1319 100644
--- a/stylesheets/screen.css
+++ b/stylesheets/screen.css
@@ -129,6 +129,7 @@ article pre {
     background: #000;
     color: #fff;
     padding: 10px;
+    overflow: auto;
 }
 
 article .gist-file pre {