dotCSS 2017 has 2 hours of content in css and more.
The world's largest CSS conference.

CSS Grid in Production
Benjamin De Cock - 16 minscsscss-grid

Variable fonts: a million times the possibilities...
Laurence Penney - 19 minscssfontsvariable-fonts

Building a search engine in CSS
Tim Carry - 16 minscss

Write Less CSS
Adam Detrick - 15 minscss

Container Queries
Jonathan Snook - 18 minscss

Media Queries 4
Florian Rivoal - 18 minscss

Schrödinger's Website
Jackie Balzer - 16 minscss

Compilers in styling web UI
Ryan Tsao - 15 minscsscss-in-js