WP theme messed up after update

Hi guys.
Since updating themes, plugins and WP update, it messed up my colorlib theme, and made a white background, that I’m now unable to edit/delete. Check put Konradi.nu

Hi there

I see the website looks weird but what exactly was different here before?

As you can see, there’s a header named “Forside” which wasn’t there before. The white background (that looks like a blank A4 paper) wasn’t there either. The layout was “build in layers” like this Skærmbillede 2021-04-08 kl. 12.01.49

Hi there

Well, that’s default WordPress them, its not our theme