code blocks have issues with the border radius and look messed up

[literon36]

Code blocks on my site look kinda messed up since the border radius doesnt apply correctly and they also seem to have another background with a color nowhere specified(???)
The only things i changed in the css are the colors, I haven't touched anything else.
I'm also using the latest commit of the theme.

Below is an example of such an occurance

Did I change something else accidentally or is this a bug?

Thanks in advance!