public static function registerCoreCss()
    {
        $fileName = \YII_DEBUG ? 'foundation.css' : 'foundation.min.css';

        \Yii::app()->clientScript->registerCssFile(static::getAssetsUrl() . '/css/normalize.css');
        \Yii::app()->clientScript->registerCssFile(static::getAssetsUrl() . '/css/' . $fileName);
    }