public function getClasses($framework)
    {
        switch ($framework)
        {
            case 'bs3':
                $classes = $this->json->bs3;
                break;
            case 'bs4':
                $classes = $this->json->bs4;
                break;
            case 'f6':
                $classes = $this->json->f6;
                break;
            case '':
            default:
                return '';
        }
        return $classes;
    }