Responsive QR Code page

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

Everything ended up working well. There's always the unknown unknowns when learning new things so let me know if I missed anything.

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

In order to centre the container with the QR code, I realized I had to make the body tag full height so that then I could centre the container vertically and horizontally within that body tag.

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

I think I did everything correctly from the looks of it but there are always unknown unknowns so let me know if I can improve something or if I missed something.