😆How to use admin_body_class filter in WordPress

https://weplugins.com/wordpress/how-to-use-admin_body_class-filter-in-wordpress/

function modify_admin_body_class_defaults($classes) { 
  $user = wp_get_current_user();
  if (in_array('subscriber', $user->roles)) {
    $classes .= ' subscriber';
  }
  return $classes; 
}
// add the filter
add_filter( "admin_body_class", "modify_admin_body_class_defaults", 10, 1 );