diff --git a/lib/rdoc/generator/template/rails/resources/css/main.css b/lib/rdoc/generator/template/rails/resources/css/main.css
index 54be384b..e1383477 100644
--- a/lib/rdoc/generator/template/rails/resources/css/main.css
+++ b/lib/rdoc/generator/template/rails/resources/css/main.css
@@ -424,6 +424,7 @@ html {
 
 #content {
   padding: 1em;
+  overflow-x: auto;
 }
 
 @media (min-width: 600px) {