Beginner QR code display Website

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

I am proud of fact that I set up a few containers to look 3D almost. I'm also proud of the fact that my website looks really close to the base design.

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

I had to research some basics I forgot how to do such as resizing images, and using flex to auto center all my content.

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

I would love to improve the background of the website. Behind all the containers, just the base body could use some more work. The default design Frontend Mentor gives us lacks a background image, so I'm having a hard time imagining how they got all the shapes & designs back there only using HTML & CSS.