Index: src/wp-admin/css/customize-widgets.css
===================================================================
--- src/wp-admin/css/customize-widgets.css	(revision 27798)
+++ src/wp-admin/css/customize-widgets.css	(working copy)
@@ -104,8 +104,9 @@
 .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;
+	border-color: #5b9dd9;
+	-webkit-box-shadow: 0 0 2px rgba(30,140,190,0.8);
+	box-shadow: 0 0 2px rgba(30,140,190,0.8);
 	position: relative;
 	z-index: 1;
 }
Index: src/wp-includes/class-wp-customize-widgets.php
===================================================================
--- src/wp-includes/class-wp-customize-widgets.php	(revision 27797)
+++ src/wp-includes/class-wp-customize-widgets.php	(working copy)
@@ -875,8 +875,8 @@
 		<style>
 		.widget-customizer-highlighted-widget {
 			outline: none;
-			-webkit-box-shadow: 0 0 3px #ce0000;
-			box-shadow: 0 0 3px #ce0000;
+			-webkit-box-shadow: 0 0 2px rgba(30,140,190,0.8);
+			box-shadow: 0 0 2px rgba(30,140,190,0.8);
 			position: relative;
 			z-index: 1;
 		}