Page that displays QR code, used CSS to apply style

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

I am proud of being able to make the page kind of resemble the requested design.

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

Challenges:

• making the page responsive;
• I am not fully understanding the pixels matters when it comes to size, need to study more;

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

I need help understanding the sizes using pixels.
Additionally:

• not sure how to use git hub, can i use the live site to display the one i just made in this challenge?