Strange green border around all of my contact forms

I’ve had my contact forms working for a while now, but after having to do some (unrelated?) troubleshooting with my parent and child theme’s functions.php files, I now have a strange green border appearing around my contact forms. It doesn’t matter which page I put the form on or which particular form I use, and I never edited any CSS that seemed like it would be related to this.

Any ideas where I should be looking to try and find the cause? It’s not site-breaking, but it’s really unprofessional looking on my business site, so I’m trying to find a fix as soon as possible. I don’t have a coding background, but if someone can just point me in the right direction I should be able to use some google-fu to figure this out.

I can post more pictures or code snippets if you think that would help. (Sorry, first time poster, not sure what to do with my hands).

PS: I’m using the Salient theme, in case that matters.

Link to page on the site with the problem

https://wordpress.org/plugins/contact-form-7/