Never thought about it, but I don't know, it feels like making triangles in css is hard. I didn't know this border thing, and not sure I understand it now either. Will have to try myself, I guess. Your approach was still great, both this one and the previous one, very ingenious.

You know, it's really fun to see this every day, sometimes after, and sometimes before figuring it out on my own. Might soon become my goto article for potds. Great, wish all you the very best.