diff --git a/actionpack/lib/action_view/helpers/javascript_helper.rb b/actionpack/lib/action_view/helpers/javascript_helper.rb
index f17c5682cf..6ed84059e1 100644
--- a/actionpack/lib/action_view/helpers/javascript_helper.rb
+++ b/actionpack/lib/action_view/helpers/javascript_helper.rb
@@ -538,6 +538,7 @@ def auto_complete_stylesheet
         content_tag("style", <<-EOT
           div.auto_complete {
             width: 350px;
+            background: #fff;
           }
           div.auto_complete ul {
             border:1px solid #888;