Rest Countries API with Color Theme Switcher

This was a pretty fun challenge to work on, learned a bunch of new stuff (implementing dark mode in React, filtering methods etc) and it didn't take too long to complete. One thing I couldn't figure out was how to have the border countries as actual names and not only as 3 letters. Also I'm not too sure if I'm applying best practices of React when implementing the application's logic. Any feedback on those or any other thing is much appreciated!