diff --git a/src/wp-admin/css/customize-widgets.css b/src/wp-admin/css/customize-widgets.css
index f8530a1372..768e7698d8 100644
--- a/src/wp-admin/css/customize-widgets.css
+++ b/src/wp-admin/css/customize-widgets.css
@@ -101,12 +101,13 @@
 	cursor: move;
 }
 
-/* @todo What does this do? */
 .control-section.accordion-section.widget-customizer-highlighted > .accordion-section-title,
 .customize-control-widget_form.widget-customizer-highlighted {
 	outline: none;
 	-webkit-box-shadow: 0 0 3px #ce0000;
 	box-shadow: 0 0 3px #ce0000;
+	position: relative;
+	z-index: 1;
 }
 
 #widget-customizer-control-templates {
diff --git a/src/wp-includes/class-wp-customize-widgets.php b/src/wp-includes/class-wp-customize-widgets.php
index 4a00078d25..74c6ee066a 100644
--- a/src/wp-includes/class-wp-customize-widgets.php
+++ b/src/wp-includes/class-wp-customize-widgets.php
@@ -734,9 +734,11 @@ class WP_Customize_Widgets {
 		?>
 		<style>
 		.widget-customizer-highlighted-widget {
-			border-radius: 2px;
 			outline: none;
+			-webkit-box-shadow: 0 0 3px #ce0000;
 			box-shadow: 0 0 3px #ce0000;
+			position: relative;
+			z-index: 1;
 		}
 		</style>
 		<?php