All solutions

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

I am waiting for your comments, thank you for your valuable time.

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

sorry for the long and complicated codes.

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

It was difficult to decide how wide the card element should be, so I added 32px padding from the right and left to the size of the QR code image(288px), and set it to 320px. At first, I tried it as a random value of 300px.