diff --git a/js/h5p-confirmation-dialog.js b/js/h5p-confirmation-dialog.js
index 22ca96c..a6dd998 100644
--- a/js/h5p-confirmation-dialog.js
+++ b/js/h5p-confirmation-dialog.js
@@ -352,7 +352,8 @@ H5P.ConfirmationDialog = (function (EventDispatcher) {
      * @param {number|null} minHeight
      */
     this.setViewPortMinimumHeight = function(minHeight) {
-      document.body.style.minHeight = (typeof minHeight === 'number') ? (minHeight + 'px') : minHeight;
+      var container = document.querySelector('.h5p-container') || document.body;
+      container.style.minHeight = (typeof minHeight === 'number') ? (minHeight + 'px') : minHeight;
     };
   }