Index: src/wp-admin/css/customize-controls.css
===================================================================
--- src/wp-admin/css/customize-controls.css	(revision 29604)
+++ src/wp-admin/css/customize-controls.css	(working copy)
@@ -232,7 +232,9 @@
 .customize-controls-close:hover,
 .control-panel-back:focus,
 .control-panel-back:hover {
-	color: #2ea2cc;
+	background: #ddd;
+	border-color: #ccc;
+	color: #000;
 	outline: none;
 	-webkit-box-shadow: none;
 	box-shadow: none;
Index: src/wp-admin/css/media.css
===================================================================
--- src/wp-admin/css/media.css	(revision 29604)
+++ src/wp-admin/css/media.css	(working copy)
@@ -705,13 +705,22 @@
 	font-weight: 300;
 }
 
+.upload-php .media-modal-close:hover,
+.upload-php .media-modal-close:focus,
 .edit-attachment-frame .edit-media-header .left:hover,
 .edit-attachment-frame .edit-media-header .right:hover,
 .edit-attachment-frame .edit-media-header .left:focus,
 .edit-attachment-frame .edit-media-header .right:focus {
-	color: #2ea2cc;
+	background: #ddd;
+	border-color: #ccc;
+	color: #000;
 }
 
+.upload-php .media-modal-close:focus .media-modal-icon:before,
+.upload-php .media-modal-close:hover .media-modal-icon:before {
+	color: #000;
+}
+
 .edit-attachment-frame .edit-media-header .left:before,
 .rtl .edit-attachment-frame .edit-media-header .right:before {
 	content: '\f341';
Index: src/wp-admin/css/themes.css
===================================================================
--- src/wp-admin/css/themes.css	(revision 29604)
+++ src/wp-admin/css/themes.css	(working copy)
@@ -455,18 +455,25 @@
 	transition: color .1s ease-in-out, background .1s ease-in-out;
 }
 
+.theme-overlay .theme-header .close:focus,
 .theme-overlay .theme-header .close:hover,
-.theme-overlay .theme-header .close:hover:before,
-.theme-overlay .theme-header .close:focus:before,
+.theme-overlay .theme-header .right:focus,
 .theme-overlay .theme-header .right:hover,
+.theme-overlay .theme-header .left:focus,
 .theme-overlay .theme-header .left:hover {
-	color: #2ea2cc;
+	background: #ddd;
+	border-color: #ccc;
+	color: #000;
 }
 
+.theme-overlay .theme-header .close:focus:before,
+.theme-overlay .theme-header .close:hover:before {
+	color: #000;
+}
+
 .theme-overlay .theme-header .close:focus,
 .theme-overlay .theme-header .right:focus,
 .theme-overlay .theme-header .left:focus {
-	color: #2ea2cc;
     -webkit-box-shadow:
     	0 0 0 1px #5b9dd9,
 		0 0 2px 1px rgba(30, 140, 190, .8);
@@ -1398,7 +1405,9 @@
 .theme-install-overlay .previous-theme:focus,
 .theme-install-overlay .next-theme:hover,
 .theme-install-overlay .next-theme:focus {
-	color: #2ea2cc;
+	background: #ddd;
+	border-color: #ccc;
+	color: #000;
 	outline: none;
 	-webkit-box-shadow: none;
 	box-shadow: none;