responsive design using flexbox

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

what makes me most proud is knowing that I did it in the estimated time, but I would like to make it more responsive for smaller devices

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

what left me wondering most about a solution was how to centralize the contents

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

I would like to know how to improve responsiveness, and whether my solution for the height of the contents using vh was the right one for the situation.