Rise: Flip Card accessibility with resizing text

Thanks for taking the time to respond. I realize now that my question "What's the best way to handle that" was poorly worded. I know I can set a fixed font size but I was wondering if the only way to deal with it is to make the design less responsive or not use flipcards at all.

I was also hoping for an accessibility perspective on flipcard text size in general: With text on a card that's limited to a square the width of your screen, you can enlarge any text only so much before it no longer fits. As a hypothetical example, if someone tried to complete a course through a smart watch or old school cell phone I wouldn't expect anyone to try and make font sizes on those devices work well for vision impaired people. That's of course an absurd example to illustrate the point. But the question behind it is what are best practices and what is reasonable to expect in terms of accessibility?