protected function renderFixedItem()
    {
        if ($this->fixedItemOptions === false) {
            return '';
        }

        $tag = ArrayHelper::remove($this->fixedItemOptions, 'tag', 'div');
        $content = ArrayHelper::remove($this->fixedItemOptions, 'content', '');

        Html::addCssClass($this->fixedItemOptions, ['fixed-item' => 'carousel-fixed-item']);

        return Html::tag($tag, $content, $this->fixedItemOptions);
    }