Mobile First QR code component using flex box

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

This is a QR code element that is coded using vanilla CSS. I am happy that I could replicate the design from scratch and made a good looking design.

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

I was confused what to use at first. I thought of using grids but later I used flex box. Dividing the components into sub sections helped me think and learn to how breakdown things into smaller task.

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

I would like help with other technologies that can be used to make the same thing. Currently I am using vanilla CSS but would love to use other technologies that might help me to build this quickly and efficiently.