diff --git a/core/modules/outside_in/js/outside_in.js b/core/modules/outside_in/js/outside_in.js
index e802a6c..4b78553 100644
--- a/core/modules/outside_in/js/outside_in.js
+++ b/core/modules/outside_in/js/outside_in.js
@@ -177,6 +177,10 @@
 
       var search = Drupal.ajax.WRAPPER_FORMAT + '=drupal_dialog';
       var replace = Drupal.ajax.WRAPPER_FORMAT + '=drupal_dialog_offcanvas';
+
+      // Calculates initial height to be applied to jQuery UI dialog widgets.
+      var height = $(document).height();
+
       // Loop through all Ajax links and change the format to offcanvas when
       // needed.
       Drupal.ajax.instances
@@ -199,6 +203,9 @@
             instance.options.data.dialogOptions = {};
           }
           instance.options.data.dialogOptions.outsideInActiveEditableId = $(instance.element).parents('.outside-in-editable').attr('id');
+          // Applies initial height to jQuery UI dialog widgets.
+          // See http://api.jqueryui.com/dialog for all dialog options.
+          instance.options.data.dialogOptions.height = height;
           instance.progress = {type: 'fullscreen'};
         });
     }