Social Links Profile using basic pseudo classes

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

I focused heavily on making the site accessible and using proper semantic HTML5 markup, which I think I have achieved to a greater effect than my previous project.

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

the main challenge was making the site more accessible, and I used tips from feedback on my previous project.

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

the footer element - I tried to always make it stay at the bottom of the page, but when the viewport is made shorter, it just overlaps on top of the main container (I used position: absolute; bottom: 0px; in the original code). Is there a way to make it stay at the bottom of the viewport, but also always make it stay under the container (not overlap on top?). I'd also appreciate any feedback on the accessibility of my code, as well as on my use of semantic HTML5 markup.