add subscriber class on HTML body

add_filter( 'body_class', 'add_subscriber_body_class' );
function add_subscriber_body_class( $classes ) {
    if ( is_user_logged_in() ) {
        $user = wp_get_current_user();
        if ( in_array( 'subscriber', (array) $user->roles ) ) {
            $classes[] = 'subscriber';
        }
    }
    return $classes;
}