The CSS Zen Garden dream shipped

Mozilla rebuilt Firefox.com using modern, native CSS without preprocessors, realizing the decades-old CSS Zen Garden vision of clean, reusable design fully separated from content. The project demonstrates that CSS has evolved sufficiently—with features like custom properties, Grid, and Flexbox—to achieve production-quality design systems without hacks or workarounds, creating over 70 components and 25 page templates that work consistently across modern browsers.