Mobile First QR app (use of pure CSS)

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

I'm proud that I built my first project in web development. I will learn css more and do other hard challenges also.

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

I took 2 hours for this project. I was struggling with flexbox properties. Somehow, with the help of google, I made this project. But I learnt a lot.

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

It helps me in writing code. Thank god, now I'm out of tutorial hell.