diff --git a/dialog.module b/dialog.module
index 17f747e..60c048e 100644
--- a/dialog.module
+++ b/dialog.module
@@ -142,7 +142,7 @@ function dialog_library() {
  * Implements hook_library_alter().
  */
 function dialog_library_alter(&$libraries, $module) {
-
+  // Replace the default implementation of misc/ajax.js.
   if ($module == 'system' && isset($libraries['drupal.ajax'])) {
     $path = 'misc/ajax.js';
     unset($libraries['drupal.ajax']['js'][$path]);
diff --git a/themes/seven/css/components/jquery.ui/theme.css b/themes/seven/css/components/jquery.ui/theme.css
index 02dc83d..3f32959 100644
--- a/themes/seven/css/components/jquery.ui/theme.css
+++ b/themes/seven/css/components/jquery.ui/theme.css
@@ -1,14 +1,14 @@
 /**
  * @file
  * Seven styles for jQuery UI.
- * Overrides /core/assets/vendor/jquery.ui/themes/base/theme.css.
+ * Overrides /misc/ui/ui.theme.css.
  */
 
 /**
  * Component containers
  */
 .ui-widget {
-  background: none;
+  background: #fff;
 }
 .ui-widget-content {
   border: none;