From a simple Call to action up to a contest. Like it was implemented very successfully here: https://magazine.pinpoll.com/en/from-0-to-30000-leads-kagiso-media-shows-how/

Also through visual design from a simple design over a Custom Design via CSS, matching to you own CI. There are nearly no limits here.

You can read more about it here:

https://magazine.pinpoll.com/en/what-is-corporate-design-and-why-is-it-so-important-for-polls/