QR code component with plain html and css

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

I am proud of the fact at how simple it turned out being. Next time I now know how to center divs better.

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

Getting the component centered vertically ended up being the biggest challenge for me. Figured out that I could make the body element display flex and that solved it for me instantly

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

I felt like I was guessing the widths and padding elements trying to eyeball compare to the image. Also I never know which sizing units I should use and when I should use them.