Create QR Code Component Project

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

I can write basic HTML and styling it almost similar to the challenge offer. any feedbacks are greatly appreciated. sorry for my bad english!

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

I have a problem with the footer element. like how to place the footer element in center.

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

What is the best approach to create a website, mobile first or desktop first? many people said its the best to come with the mobile first, but I am dont understand how can I start to create a website with small screen.