Image and CSS issue

Now I KNOW there is a simple solution to this… Just can’t figure it out.

So I’ve got these sidebar images…(built into widgets using the Display theme)
https://feedlocal.org/about-2/our-partner-farms

They’re each linked to a page, but I don’t want that little box to appear around the image when a user clicks on it.

What am I doing wrong?
help! and thank you very much!