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I figured out, I accidentally got a very outdated AUR package. I installed the newest one, version 4.2.4.

But the problem still exists. The background colour is light green (when the expression is valid) or light red (if the expression is invalid) and the font colour is now the system font which is white and hard to read in front of the bright background colour.

But I can solve it. There is an option under "Edit → Preferences → Appearance → Font and Colors" where I can set the colour.

Sorry for the fuss.