diff --git a/lib/assets/javascripts/builder/mustache-templates/infowindows/infowindow_header_with_url.jst.mustache b/lib/assets/javascripts/builder/mustache-templates/infowindows/infowindow_header_with_url.jst.mustache
index 66f7c24..84d5843 100644
--- a/lib/assets/javascripts/builder/mustache-templates/infowindows/infowindow_header_with_url.jst.mustache
+++ b/lib/assets/javascripts/builder/mustache-templates/infowindows/infowindow_header_with_url.jst.mustache
@@ -1,4 +1,4 @@
-<div class="CDB-infowindow CDB-infowindow--light js-infowindow zhongjin" data-h5url="true">
+<div class="CDB-infowindow CDB-infowindow--light js-infowindow" data-h5url="true">
   <div class="CDB-infowindow-close js-close"></div>
   <div class="CDB-infowindow-container">
     <div class="CDB-infowindow-header CDB-infowindow-headerMedia js-header js-cover">
@@ -12,6 +12,8 @@
           {{/value}}
         {{/content.fields.1}}
       </div>
+      <iframe id="mainContent" width="100%" height="100%" src=""></iframe>
+
     </div>
     <div class="CDB-infowindow-inner js-inner">
       {{#loading}}<div class="CDB-Loader js-loader"></div>{{/loading}}