diff --git a/js/misc/_vertical-tabs.js b/js/misc/_vertical-tabs.js
index 041ce5e..63e8f42 100644
--- a/js/misc/_vertical-tabs.js
+++ b/js/misc/_vertical-tabs.js
@@ -29,8 +29,8 @@ Drupal.behaviors.verticalTabs = {
       }
 
       // Create the tab column.
-      var tab_list = $('<ul class="nav nav-tabs vertical-tabs-list"></ul>');
-      $(this).wrap('<div class="tabbable tabs-left vertical-tabs clearfix"></div>').before(tab_list);
+      var tab_list = $('<ul class="nav nav-pills nav-stacked vertical-tabs-list col-xs-4 col-md-3"></ul>');
+      $(this).wrap('<div class="tabbable tabs-left vertical-tabs clearfix well"></div>').before(tab_list);
 
       // Transform each fieldset into a tab.
       $fieldsets.each(function () {