Multiple Choice: inputs don't have a border and are hard to recognise

[jmuheim]

It's nearly impossible to enter a question using the mouse, and the answer inputs are hard to recognise, too.

[jmuheim]

This also seems to be the case for evaluation quizzes:

[qtnc]

This is probably a CSS problem only; it's for Anton or maybe for you.

[jmuheim]

Absolutely. By the way, you can include other users into issues by entering their name, with an @ sign in front of it, like this: @AntonBolfing. GitHub presents a dropdown immediately when entering an @, i don't know whether this is accessible or not.