Ticket #28655: 28655.5.patch

wp-admin/customize.php

@@ -108 +108 @@
                                 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 class="back customize-controls-close" href="<?php echo esc_url( $return ? $return : admin_url( 'themes.php' ) ); ?>"></a> 
                         </a>
                 </div>
 

wp-admin/css/customize-controls.css

@@ -212 +212 @@
 #customize-header-actions a.back {
         position: relative;
         left: 0;
+        visibility: hidden;
         -webkit-transition: left ease-in-out .18s;
         transition: left ease-in-out .18s;
 }
 
+.customize-controls-close:before {
+        font: normal 30px/1.5 dashicons;
+        color: #000;
+        width:30px;
+        padding: 0 7.5px 0 7.5px;  
+        content: "\f335";  
+        position: fixed; 
+        visibility: visible;
+        top: 0px;
+        left: 0;
+        border-right: 1px solid #ddd;
+}
+
+.customize-controls-close:hover::before {  
+        background-color: #0074a2;  
+        color: #fff;  
+        outline: none; 
+}  
+
 .in-sub-panel #customize-header-actions a.back {
         left: -120px;
 }