How to add padding on Portfolio hover?

Hello!

I have been a very satisfied user of your Multicorp Agency template for quite some time. I have a quick question I’m hoping you can answer for me. Here is my site: [HIDDEN]

Please scroll down to the “Our Work” portfolio gallery. When you rollover any of the images, there is no padding protecting the text from the edges of the red box.

I’ve been struggling to find where to change this in the CSS. Can you please help?

Thank you very much :)