How Can I customize the Contact form made using jetpack

oh, here is the URL of my contact page, I forgot to mention https://geekstopten.com/contact

You can customize the look of the form with CSS. To do so, simply add your custom CSS code at the bottom of your theme stylesheet, or in your custom CSS editor under Appearance > Edit CSS in your dashboard.

If you’re not familiar with CSS, you can check these tutorials:
https://www.htmldog.com/guides/cssbeginner/
https://dailypost.wordpress.com/2013/07/25/css-selectors/

If you’re happy with the form’s look, but want to add or edit fields, you can follow the instructions here:
https://jetpack.me/support/contact-form/

I hope this helps.