Can you make the text darker in Canvas assignments?
Text-to-background contrast ratios in Canvas have always been a problem! I really blame "fashion" trends. The fashion in web page development seems to really favor that nasty pale grey text. I see it on every website I go to anymore! I would suggest setting your user account to High-Contrast mode. Learn more at What feature options can I enable in my user account as a student? Not just for students, as it works the same for all users.
Now on to the bigger picture. I would suggest submitting a feature idea to improve the contrast ratios in Canvas so that mode is not even needed. It is one of the areas where accessibility fails in Canvas, despite all their other strong accessibility options. You can learn how to submit a feature idea at How do I create a new feature idea in the Canvas Community?
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