Here’s a complete and utter noob question/comment/observation:
I’ve gone through the guides and the FAQ and nowhere could I find it explained that the colour of the background in reviews actually matters! I thought it was just an aesthetic choice for the web designers! I saw the FAQ on the colours as they pertain to levels and as I don’t really care about that, but just want to proceed at my own self-study pace.
Then here I am, looking at 下. Uhm… か! No, loser, it’s した! Blabla on-yomi, blabla kun-yomi. But, but, I just only did my review yesterday and it was か!
Oh, wait… that one was with a blue background, this one had a pinkish tint. Does that make a difference? Apparently it does! Blue is the radical, pink the Kanji. (and Purple is for vocab?)
What do colourblind people do? Is this actually clearly explained or am I just too old and dense (OK, boomer) when everybody else just got it?