Kevin Powell is a Canadian developer and one of the most cited independent voices on modern CSS — running the Kevin Powell YouTube channel, which has anchored a generation of front-end developers' relationship with CSS. He is widely respected for the patience and depth of his explanations of the parts of CSS that the language's reputation as a quirky historical accident often obscures.
The course catalog covers modern CSS in depth: Grid and Flexbox layout, custom properties (CSS variables), modern responsive design (container queries, the dynamic viewport units, modern color spaces), CSS animations and transitions, typography on the web, and the design-system thinking that connects CSS to broader UI work. Material is structured for working developers building real interfaces.
The CourseFlix listing under this source carries 7 Kevin Powell courses spanning that range. Material is paid; Kevin Powell's courses are sold individually on the original platform. Courses are aimed at developers ready to make CSS a deliberate craft rather than an afterthought.