Four card feature section with Flexbox

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

How it turned out

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

Took me an embarrassingly long time to make sense of how to recreate the card section. Turns out I could use flex-column and just add vertical margin in the first and last elements.

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

From what I said above, you will realize that the cards aren't written to be generic utilities like I'd hoped. I would appreciate any suggestions to turn those card classes into a generic utility.