Responsive QR code component using html and css

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

using of flexbox is little tricky in body section , I'll remember the technique which I used here.

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

centering a div in Body section give me challenge , go through some stack overflow article and found out that I've to give body a height & width and apply flexbox.

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

it easy for me now.