Overview
CSS is a cornerstone technology of the web. It allows developers to separate content (HTML) from presentation (CSS), enabling better accessibility, flexibility, and control over the visual layout of web pages.
Core Concepts
- Selectors: Patterns used to select the elements you want to style.
- Properties and Values: Defining how the selected elements should look (e.g.,
color: red;). - The Cascade: The rules that determine which styles are applied when multiple rules conflict.
- Specificity: A weight applied to a given CSS declaration, determined by the number of each selector type in the matching selector.
Modern CSS
Modern CSS includes powerful layout systems like Flexbox and CSS Grid, as well as support for variables (custom properties) and media queries.