add_filter( 'body_class', 'prefix_body_class' ); /** * Adds a css class to the body element. * * @param array $classes the current body classes. * @return array $classes modified classes. */ function prefix_body_class( $classes ) { $classes[] = 'class-name'; return $classes; }
or
//* Add custom body class to the head add_filter( 'body_class', 'gk_body_class' ); function gk_body_class( $classes ) { $classes[] = 'custom-class'; return $classes; }