QR code component used HTML CSS (Desktop/Mobile)

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

I can say proud of myself in CSS coding.

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

Problems caused by inexperience during the deployment phase, but can be solved with google search.

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

As specifically I feel incomplete generate class name in coding HTML and I think a beginner at JS. Especially i want to improve myself in JS programming.