Indicating correct answers without only using color

[sahi1l]

Describe the bug For some multiple-choice questions, the only indicator that the student may move on or not is a green or red-colored box, which is potentially problematic for color-blind users.

To Reproduce Steps to reproduce the behavior:

1. Go to e.g. https://runestone.academy/runestone/static/ac101summit/GeneralIntro/Algorithms.html
2. Click on the correct answer.

Expected behavior I would expect some other indication that the answer is correct or that the student may move on. A symbol, some text like "Correct" or "Proceed", or whatever is most appropriate.

[bnmnetp]

How does this look? Blue seems to be the best alternative to green in looking at the designing for colorblindness sites... Plus there's the Check

[sahi1l]

I think you could keep the green if you want (it goes well with the Check Me button), so long as you have the checkmark.