Interactive card details form

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

This one has some new things to do in form components and some different than usual challenges to layout cards (literally).

What challenges did you encounter, and how did you overcome them?

Allowing specific no. of digits to be entered and limiting the options, verifying and showing error messages accordingly, also positioning, it is the most difficult images positioning challenge I've done, it took me a while to find the best possible setup i can think of.

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

All sorts of suggestions will be appreciated.