Social Links Page using Flexbox

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

I'm proud of the amount of time it takes to do this project, unlike my previous ones. Learn more about DIvs and how to properly center them in a page.

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

Sizing is always an issue for me. knowing where to use px instead of percentages. The use of em or rem still not 100% but its a learning process.

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

I would love a course of how to properly know when to use px instead of percentages and em or rem. How do you properly set up your page so its look great on most devices. Maybe suggestions on other methods to set up boxes layout on pages.