Andy Bell is a UK-based front-end developer, founder of Set Studio, and one of the most widely cited modern voices on CSS and intrinsic web design. He is the author of Every Layout (with Heydon Pickering) and the Complete CSS course, and runs the Piccalilli publication.
His CourseFlix listing carries an Andy Bell CSS course. Material is paid and aimed at front-end developers ready to think about CSS as an architectural concern rather than a styling afterthought.