[Theme: Minimatica] Change colour of 'Continue reading' box when viewing posts

I would very much like to change the colour of my currently black box, which surrounds the link: “Continue reading”, when viewing multiply posts under a category.

Right now it’s black, which makes it a bit hard to distinguished from the regular title boxes.

Another problem is that it seems to change into a horrible light blue color whenever you hover above it.

Where in the stylesheet can you edit the box? C:

Site: https://anitasimonsen.com/?cat=3

Thanks for your time!