Historically, CSS has been used for one thing: decorating webpages. But later versions of the stylesheet language have added extra bells and whistles, allowing developers to do more ambitious (and, dare I say, bonkers) things.
That’s right. A pure CSS version of Mario Kart.
For what it’s worth, a lot of stuff from the official game is absent, including other racers, and any sense of progression. However, it’s worth talking about what’s there, because even with a few missing pieces, it’s still pretty damn cool.
You can change characters, and switch between Mario and Bowser, who are animated and don’t feel especially static. The terrain moves with your player, so it feels like you’re actually moving with speed, even if you’re not actually going anywhere.