How to exlude page builder from certain styling.

Hello,

My website theme means that widgets have a small border on the top, which looks great. The only problem, is because page builder is built up using widgets, it adds a line in between each widget on page builder (which I don’t want).

Temporarily I have added the following code into my theme custom css:
.widget { border-top: 0px; }
.post-title-divider { display: none; }

However, Ideally I would still like these borders to appear on my sidebar and footer widgets.

Any ideas?

Anna