Contact Form in Pop-Up looks terrible

I'm using the wordpress contact form in the pop-up here and it looks terrible

(takes 15 seconds to load).

A mailchimp embed looked much better, but requires users to confirm "subscription" and this pop-up is meant to be a contact form, not a newsletter sign-up.

So back to the simple wordpress contact form - but it looks terrible, font is tiny, fields are small and squished together - adding or removing an image makes no difference.

Thoughts on how to fix or a different method?