public function getPreviewImageUrl()
    {
        $previewPath = $this->getConfigValue('previewImage', 'assets/images/theme-preview.png');

        if (File::exists($this->getPath().'/'.$previewPath)) {
            return Url::asset('themes/'.$this->getDirName().'/'.$previewPath);
        }

        return Url::asset('modules/cms/assets/images/default-theme-preview.png');
    }