Css flex

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

I got some sizes perfectly

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

first I couldn't get the exact height and width of the container with its padding, but eventually I had help from some videos explaining the issue and I read some documents from MDN

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

the container height and margins, please help newbie here