Index: wp-admin/js/customize-controls.js
===================================================================
--- wp-admin/js/customize-controls.js	(revision 28867)
+++ wp-admin/js/customize-controls.js	(working copy)
@@ -1045,15 +1045,13 @@
 
 				if ( ! activated() ) {
 					save.val( api.l10n.activate ).prop( 'disabled', false );
-					back.text( api.l10n.cancel );
-
+					
 				} else if ( saved() ) {
 					save.val( api.l10n.saved ).prop( 'disabled', true );
 					back.text( api.l10n.close );
 
 				} else {
 					save.val( api.l10n.save ).prop( 'disabled', false );
-					back.text( api.l10n.cancel );
 				}
 			});
 
@@ -1197,13 +1195,6 @@
 
 		api.trigger( 'ready' );
 
-		// Make sure left column gets focus
-		topFocus = $('.back');
-		topFocus.focus();
-		setTimeout(function () {
-			topFocus.focus();
-		}, 200);
-
 	});
 
 })( wp, jQuery );
Index: wp-admin/customize.php
===================================================================
--- wp-admin/customize.php	(revision 28867)
+++ wp-admin/customize.php	(working copy)
@@ -108,9 +108,7 @@
 				submit_button( $save_text, 'primary save', 'save', false );
 			?>
 			<span class="spinner"></span>
-			<a class="back button" href="<?php echo esc_url( $return ? $return : admin_url( 'themes.php' ) ); ?>">
-				<?php _e( 'Cancel' ); ?>
-			</a>
+			<a class="back" href="<?php echo esc_url( $return ? $return : admin_url( 'themes.php' ) ); ?>"></a>
 		</div>
 
 		<?php
Index: wp-admin/css/customize-controls.css
===================================================================
--- wp-admin/css/customize-controls.css	(revision 28867)
+++ wp-admin/css/customize-controls.css	(working copy)
@@ -209,6 +209,31 @@
 	height: 22px;
 }
 
+a.back {
+	color: #444;
+	display: block;
+	position: fixed;
+	top: 0;
+	z-index: 99;
+	left: -48px;
+	width: 45px;
+	height: 45px;
+	padding-right: 2px;
+	background: #eee;
+	border-right: 1px solid #ddd;
+	cursor: pointer;
+	-webkit-transition: left ease-in-out .18s, color ease-in .1s;
+	transition: left ease-in-out .18s, color ease-in .1s;
+}
+
+
+a.back:hover,
+a.back:focus {
+	background-color: #0074a2;
+	color: #fff;
+	outline: none;
+}
+
 #customize-header-actions a.back {
 	position: relative;
 	left: 0;
@@ -216,6 +241,14 @@
 	transition: left ease-in-out .18s;
 }
 
+a.back:before {
+	font: normal 29px/1 dashicons;
+	content: "\f335";
+	position: relative;
+	top: 9px;
+	left: 9px;
+}
+
 .in-sub-panel #customize-header-actions a.back {
 	left: -120px;
 }
@@ -223,8 +256,13 @@
 .wp-full-overlay-sidebar .wp-full-overlay-header {
 	-webkit-transition: padding ease-in-out .18s;
 	transition: padding ease-in-out .18s;
+	padding: 0 15px 0 0;
 }
 
+.wp-full-overlay-sidebar .wp-full-overlay-header a.back {
+	margin-top: 0;
+}
+
 .in-sub-panel .wp-full-overlay-sidebar .wp-full-overlay-header {
 	padding-left: 62px;
 }