Social Links Profile w/CSS and HTML

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

I was able to finish this solution in

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

I found issues whether I should use span or button for the social media links. I ended up building solutions using both and so they both worked - but I'm unsure which is the more correct/semantic in this case.

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

Would love someone to look at the CSS to make sure it follows best practices. Based on feedback from previous exercises, I ensured that I avoid using 'px' as much as possible and use BEM for naming convention.