The same evening I shipped this, Chrome opened "New in DevTools" and proudly announced DevTools for agents: AI that reads your CSS rules. Thanks Google, I'll take it as a sign I'm on the right track. Their version is for AI agents. Mine is for a 53-year-old guy pressing F6😂😂😂😂😂😂. We've all done it. A popup stays behind the header, so you write z-index: 999 . Then 9999 . Then 99999 . Nothing changes. The problem is almost never the element you're fixing. It's one of its ancestors . ...