Responsive layout with custom CSS and Flexbox

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

The thing I am proud of the most is that I was capable of building the layout using semantic HTML tags, while stylizing them with pure CSS (specifically Flexbox)

On the other hand, something I would do different next time is using relative sizes like (em or rem) instead of absolute sizes (px)

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

The greatest challenge I found was understanding how the box model works.

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

I would appreciate any correction or tip on how I used flexbox in this project