On October 10, 1994, Håkon Wium Lie published the first proposal for “Cascading HTML style sheets”. Since then, CSS has been one of the technical foundations for the web. A good occasion to celebrate CSS in style! In this talk Håkon will examine some of the key moments in the history of CSS and the web. You will also be encouraged to look under the hood to fully understand how the web works and to print your own book.