The absolute first thing we did with CSS was use it to stop underlining links. Overnight, the entire internet converted into this sludge of a medium where text looked like links and links looked like text. You had no idea where to click, but hell that didn’t really matter anyway because we had developed cursor effects (you haven’t lived until your mouse had a trail of twelve fireballs behind it).
This was such a compelling use of advanced technology that it was literally all we used CSS for initially. I even have proof from an index.shtml (fuck yes SSI) file from 2000.