enqueued thickbox style as it was not loading the thickbox

Author: tareq1988

class.settings-api.php

@@ -40,6 +40,7 @@ public function __construct() {
      */
     function admin_enqueue_scripts() {
         wp_enqueue_style( 'wp-color-picker' );
+        wp_enqueue_style( 'thickbox' );
 
         wp_enqueue_script( 'wp-color-picker' );
         wp_enqueue_script( 'jquery' );