Design-wise it looks very nice. It's just one thing I should change. The centered text (På grund af de både konkrete og overbevisende...). Centered text is considered hard to read and a little "newbie". The other centering I don't mind. Personally I wouldn't center the main heading either, but it isn't disturbing. But seeing other headings on other pages on the site isn't centered it would be more consistent if it was left aligned.
You have a serious HTML error though. See the two last errors here.
https://validator.w3.org/nu/?showsource=yes...-for-studerendeI assume you are stuck with the other errors as I guess they come form the layout that's common for the whole site.
Problems with the CSS too.
https://jigsaw.w3.org/css-validator/validat...ng=&lang=enHeld og lykke!