How we write and think about CSS has changed significantly since the web’s beginning.

We’ve come a long way from table-based layouts, to responsive web design, and now into a new era of adaptive layouts powered by modern CSS features.

Managing and organizing CSS has always been challenging, where consensus is hard to find.

CSS is always changing, adapting and growing, if you've been using it since the early days it's a very different, but similar, language / framework.