diff --git a/static/skin/kiwix.css b/static/skin/kiwix.css
index 5a92b07c..76abebfe 100644
--- a/static/skin/kiwix.css
+++ b/static/skin/kiwix.css
@@ -101,6 +101,10 @@ body {
     padding: 20px;
 }
 
+#content_iframe {
+    background: #f9f9f9;
+}
+
 #uiLanguageSelector {
   display: none;
 }