The font on Canvas, especially on quizzes, is often far too small. It would be a great feature to add to change the default font size. I have decent vision and oftentimes the quizzes are difficult to see even for me. I cannot imagine how stressful tests must be for people with poor vision.
(I have resulted in using a chrome extension to do some custom CSS to increase the font-size to 1.5em on quizzes.)