
CSS Animations Tutorial: Keyframes, Transitions, and Timing
CSS animations come in two forms: transitions and keyframe animations.
Sass is a CSS preprocessor you write in an enhanced syntax with variables, nesting, mixins, and functions, then compile to plain CSS.
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CSS animations come in two forms: transitions and keyframe animations.

The CSS box model describes every element as four nested layers: content in the center, padding around it, a border around the padding, and margin outside.

A CSS gradient is a smooth blend between two or more colors that the browser paints as an image, usable anywhere an image is valid.

CSS Grid is a two-dimensional layout system for building rows and columns at once.

A CSS media query applies styles only when the browser meets a condition, usually viewport width.

Sass nesting is a build-time feature that compiles to flat CSS and glues selectors as text, so `&__title` becomes `.card__title`.
The core rules every developer needs: cascade, specificity, box model, and units.
Build real layouts with Flexbox and CSS Grid instead of fighting the page.
Media queries, mobile-first CSS, and images that adapt to every screen.
Animations, custom properties, and gradients that add polish without JavaScript.
Install Sass, compile it, and choose between preprocessors and PostCSS.