launchdown countdown timer with react + ts

I have to allow a little difficulty in thinking about the logic to make the cards flip, I tried it in different ways and after several attempts, I believe I got pretty close to the final result.

I learned several things, mainly css, which I believe is the biggest challenge in the code.

Something I still don't like is the way I needed to create the animation, I couldn't control the state in other ways, if you have any suggestions, I'm all ears.

Thanks for the feedback, I will make the responsive version in the future.