Why is YouTube doing this? Black text on black background.

I don't understand why it's suddenly doing this when I go to write a comment. It's typing black text on black background. I haven't changed anything recently and it was fine yesterday. Yesterday it was typing white text on black background. Apologies if i tagged wrong. I was not sure if it was meant to be tagged as bug or UI change so I guessed bug as I didn't mean for this to happen. https://preview.redd.it/qjrv02thtl6e1.png?width=1267&format=png&auto=webp&s=4a009f4521fb00932a07c18d69dbfe7c7843611a