Age calculator app - React, CSS

What are you most proud of, and what would you do differently next time?

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I decided to do this project with React to work on my skills. This was more difficult than I expected, but in the end it was worth it. The code is probably not very good though; there are a lot of states just for little cosmetic things, but I did it to get the look and feel just right.

What specific areas of your project would you like help with?

I still struggle with responsive design. In the end, even though the css code is all over the place I think I did a decent job, but there's room for a lot of improvement.