What is CSS?
CSS (Cascading Style Sheets) is the language for visual styling of web pages. It defines colors, fonts, layouts, spacing, and animations. "Cascading" means styles can come from multiple sources and are weighted by specificity. Modern CSS features: Flexbox and Grid for layouts, CSS Variables (Custom Properties), Media Queries for responsive design, CSS Animations and Transitions. CSS frameworks like Tailwind CSS, Bootstrap accelerate development. CSS preprocessors like Sass/SCSS extend CSS with variables, nesting, and mixins. Critical CSS (above-the-fold) should be inline for fast rendering.
Key Points
- Stylesheet language for visual design
- Cascading = inheritance and specificity
- Flexbox and Grid for modern layouts
- Media Queries for responsive design
- Frameworks: Tailwind, Bootstrap
- Critical CSS inline for performance
Practical Example
“With Tailwind CSS and CSS Grid, we create responsive layouts without writing custom CSS.”