diff --git a/styles/output.css b/styles/output.css
--- a/styles/output.css
+++ b/styles/output.css
@@ -116,7 +116,9 @@ margin-bottom: 2px;
 #tabs li a:visited {
         color: rgba(255,255,255,1);
 }
-#tabs li a:hover, .ui-tabs-selected a  {
+#tabs li a:hover, .ui-tabs-selected a
+{
+  background: rgb(200,200,200) !important; /* fallback */
         background: rgba(200,200,200,1)!important;
         color: rgb(0,0,0)!important;
 }