- Add filter to disable parent stylesheet `shell_parent_css`
  usage in child theme:
  `/* Add the child theme setup function to the 'after_setup_theme' hook. */
   add_action( 'after_setup_theme', 'shell_child_theme_disable_parent_css', 10 );

   /**
    * Disable Parent CSS
    * 
    * @since 0.2.0
    */
   function shell_child_theme_disable_parent_css(){
       add_filter('shell_parent_css','__return_false');
   }`