CSS (Cascading Style Sheets) describes the visual presentation of HTML content by applying rules that map selectors to property values. It separates structure from presentation, enabling consistent theming and easier maintenance through the cascade, specificity, and inheritance rules. Core concepts include the box model, layout techniques such as flexbox and grid, responsive design with media queries, and dynamic effects via transitions and animations. Modern CSS also supports custom properties (variables), functions, and tooling like preprocessors or postprocessors, with broad browser compatibility considerations and performance implications tied to rendering, painting, and layout costs.

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CSS

Styles web pages by selecting elements and applying colors, layouts.

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