Why Learn CSS?

Practical reasons CSS is worth learning properly:

• Every web page uses it — websites, web apps, desktop apps built with web technology (like VS Code), mobile apps built with web views, HTML email, and printed documents generated from HTML.
• It's how interfaces get their quality — spacing, typography, contrast, and motion are what make an interface feel polished and easy to use.
• Responsive design — one codebase that works on phones, tablets, laptops, and huge monitors is only possible with CSS.
• Accessibility — readable text, sufficient contrast, visible focus, respect for reduced-motion and dark-mode preferences are all CSS.
• It's far more capable than it used to be — Grid, container queries, :has(), nesting, cascade layers, and modern color functions replace many hacks and much of the JavaScript that layout once needed.
• Frameworks don't replace it — Tailwind, Bootstrap, and component libraries are CSS; debugging them requires knowing CSS.

Trade-offs worth knowing up front: CSS is easy to start and hard to master. The cascade and layout algorithms have rules you need to learn rather than guess, errors are silent (the browser skips what it doesn't understand), and large stylesheets need structure to stay maintainable. This course covers all three.