I recently became aware of the extinction symbol through Orbital Operations, Warren Ellis’ mailing list. Something about having a visual moniker, an icon, to represent our distress in the face of the Sixth Mass Extinction resonated with me. The icon itself is fairly simple, and I thought “hey, I bet I could make that just using CSS.” So I did. I leaned heavily on the shapes of CSS from CSS Tricks, though getting the shapes to nest and line up correctly was a bit tricky. If you’re interested in the code, take a look at the ExtinctionCSS repo on GitHub. Pull requests welcome!