How to fix styling around logo?

Hello. I have move a wordpress site from external hosting to our internal servers.

Anyway, I have copied the custom theme it was using and have installed and activated it on the new host.

I do have a minor issue with the theming around the logo.

Here’s a link to the header/logo on the old site. Here’s a link of the same logo on the new site.

As you can see, there’s a blueish background around the logo that is not present on the old site. How do I remove this? I’ve looked around and I cannot find a way to change it.

Thanks a lot