protected function getCreateFormFields()
    {
        return FieldList::create([
            TextField::create(
                'Url',
                'Embed URL'
            )
                ->setInputType('url')
                ->addExtraClass('insert-embed-modal__url-create')
                ->setDescription(_t(
                    __CLASS__.'.UrlDescription',
                    'Embed Youtube and Vimeo videos, images and other media directly from the web.'
                )),
        ]);
    }