Was introduced to the site my freshman year of university ~2016. Our web professor used it as a project for getting everyone more familiar with CSS in the intro

Was introduced to the site my freshman year of university ~2016. Our web professor used it as a project for getting everyone more familiar with CSS in the intro web course, and each student had to come up with a different design. I ended up making the page look like a text editor and REPL if I remember correctly. It was a lot of fun and a good learning experience! So many ::before and ::after's though...