Describe the bug

The transparency of the course cards within the LTI course selection seems to be very high and the cards are very hard to read as a result.

To Reproduce

1. Go to https://moodle.ase.in.tum.de/
2. Log in as test-user 16
3. Select the LTI testing course
4. Create a new learning activity
5. Enter the content selection

Expected behavior

The course selection cards are in good contrast to the iFrame and the information is readable without issues

Screenshots

Which version of Artemis are you seeing the problem on?

8.0.0

What browsers are you seeing the problem on?

Chrome

Additional context

No response

Relevant log output