diff --git a/cms/templates/content_libraries/xblock_iframe.html b/cms/templates/content_libraries/xblock_iframe.html
index b6e455f78515..1b65036129cb 100644
--- a/cms/templates/content_libraries/xblock_iframe.html
+++ b/cms/templates/content_libraries/xblock_iframe.html
@@ -156,7 +156,7 @@
 <!-- The default stylesheet will set the body min-height to 100% (a common strategy to allow for background
   images to fill the viewport), but this has the undesireable side-effect of causing an infinite loop via the onResize
   event listeners below, in certain situations.  Resetting it to the default "auto" skirts the problem.-->
-<body style="min-height: auto">
+<body style="min-height: auto; background-color: transparent;">
   <!-- fragment body -->
   {{ fragment.body_html | safe }}
   <!-- fragment foot -->
