public function getColumnResetsAsString($index, $tag = null)
    {
        $tag = $tag ?: 'div';

        return implode(
            PHP_EOL,
            array_map(
                function ($item) use ($tag) {
                    return sprintf(
                        '<%s class="clearfix visible-%s-block"></%s>' . PHP_EOL,
                        $tag,
                        $item,
                        $tag
                    );
                },
                $this->getColumnResets($index)
            )
        );
    }