QR code using html and CSS

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

I finished my first challenge but it took more time than I expected

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

I didn't changed the read me file when I did work on the project. As I am submitting the solution a long time after I finished I don't remember the steps I followed. Will do better for the next challenge.

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

I would like to know if the css structure is optimal, meaning are there some improvements to make it shorter ?