public function end_lvl(&$output, $depth = 0, $args = [])
    {
        $tab = '    ';
        $indent = ($depth == 1) ? 8 + $depth : 7 + ($depth * 2);

        switch ($args['style']) {
            case 'div':
                break;
            case 'ol':
            case 'ul':
            default:
                $output .= str_repeat($tab, $indent);
                break;
        }

        parent::end_lvl($output, $depth, $args);
    }