Big Buttons

At some point a theme or some other update made my buttons bigger on some site and changed their color

This is one of them
https://imgur.com/a/i3kw7ES

Is there a way to fix this or reason it happend. Thes used to be a lot smaller with a clear transparnet background with a then border.
https://forestparkdental.com/

Noticed this on two of my sites without changing or editing anything.. Just updated theme and WP alogn the way.

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