Learn CSS design techniques that make sites fast, flexible, and modern—Flexbox, Grid, responsive patterns, and smooth animations—without extra JavaScript.
Learn the essential breakpoints for responsive design: 320, 360, 375, 768, 1024, 1200, 1440px. Get mobile-first media query patterns that work in production.
Learn how to serve faster, sharper images with srcset, picture, and CSS image-set. Practical responsive image fixes that cut file sizes and boost Core Web Vitals.
Learn responsive web design basics: fluid grids, flexible images, and media queries that make one site work beautifully on phones, tablets, and desktops.