Free interactive · CSS
Start from the ground‑up with CSS fundamentals, then master layout, animation, responsive design, performance, accessibility and modern tooling. Build a professional design system and ship production‑ready styles.
What you'll learn
Curriculum preview
What is CSS?
CSS controls the visual presentation of HTML.
Adding CSS to a Page
Prefer external stylesheets for reusability and caching.
Basic Selectors
Selectors are the bridge between HTML and CSS.
The Cascade & Specificity
The cascade follows origin → importance → specificity → source order.
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