Noël discussed the importance of the box model in CSS, focusing on box sizing and its evolution over time. He explained the different box models in CSS, including content box, padding box, and border box, and emphasized the challenges developers face when designing websites to fit specific screen sizes. Noël also discussed the best method for resetting CSS styles and the importance of setting box sizing to 'border box' when using float and when adding content using 'before' or 'after' pseudo-elements.
