diff --git a/core/modules/responsive_preview/js/responsive-preview.js b/core/modules/responsive_preview/js/responsive-preview.js
index 04ae40d..af7a18f 100644
--- a/core/modules/responsive_preview/js/responsive-preview.js
+++ b/core/modules/responsive_preview/js/responsive-preview.js
@@ -117,6 +117,13 @@ Drupal.behaviors.responsivePreview = {
       var $frameBody = $(window.self.document.body).once('responsive-preview');
       if ($frameBody.length > 0) {
         $frameBody.get(0).className += ' responsive-preview-frame';
+        // Call Drupal.displace in the next process frame to relayout the page
+        // in the iframe. This will ensure that no gaps in the presentation
+        // exist from elements that are hidden, such as the toolbar.
+        var win = window;
+        window.setTimeout(function () {
+          win.Drupal.displace();
+        }, 0);
       }
     }
   },
@@ -211,7 +218,7 @@ Drupal.responsivePreview = Drupal.responsivePreview || {
   },
   views: {
     /**
-     *
+     * Manages the PreviewView.
      */
     AppView: Backbone.View.extend({