When IPhone is in dark mode, text turns white on a white background (-> becomes unreadable)

I just picked up this app due to finding a post about it on reddit, looking for something to help me learn the stroke order of kana because I learn best by writing them. Immediately upon starting my first lesson, I got a pop up saying "Tutorial: Hiragana." However, the text was nearly unreadable. It was white on a white background.

I thought it might be an issue with my brightness settings etc. and discovered that after turning off dark mode, the text became black and I could read it. This is a temporary fix but I'd like to not have to switch between dark and light mode just for one app.

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