diff --git wp-admin/css/customize-controls.css wp-admin/css/customize-controls.css
index becc7a5..21a4bbc 100644
--- wp-admin/css/customize-controls.css
+++ wp-admin/css/customize-controls.css
@@ -764,8 +764,9 @@ p.customize-section-description {
 /* Header control: overlay "close" button */
 
 .customize-control-header .uploaded .header-view .close {
-	font-size: 2em;
-	color: grey;
+	font-size: 20px;
+	color: #fff;
+	background: rgba(0, 0, 0, 0.5);
 	position: absolute;
 	visibility: hidden;
 	top: 10px;
@@ -774,15 +775,12 @@ p.customize-section-description {
 	width: 20px;
 	height: 20px;
 	cursor: pointer;
+	padding: 2px;
 }
 
 .customize-control-header .uploaded .header-view .close:hover {
- color: black;
- text-shadow:
-    -1px -1px 0 #fff,
-    1px -1px 0 #fff,
-    -1px 1px 0 #fff,
-    1px 1px 0 #fff;
+  color: #FFF;
+  text-shadow: none;
 }
 
 .customize-control-header .header-view:hover .close {