
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.

CSS clamp() takes three values — clamp(min, preferred, max) — and returns the preferred value as long as it stays between the minimum and maximum.

CSS container queries style an element based on the size of its parent container rather than the viewport.

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.
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.