Fix contact form 7 layout on mobile

Hello everyone, I would like to know how to correct the contact form 7 layout which appears correctly in the desktop version, but is disproportionate on mobile. How can I make the same layout as the desktop version appear on mobile using CSS or other solutions without entering the theme editor since I’m not familiar with it? I’m using the Lovecraft theme. Thanks everyone for the reply.

The page I need help with: [log in to see the link]