QR code component using plain CSS and HTML

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

I managed to make it identical to the design and in a timely manner, but next time I would code mobile first.

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

Centering the div vertically, but a quick search jogged my memory.

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

This challenge is simple but my main concern is the semantics of HTML