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---
title: CSS
slug: Glossary/CSS
page-type: glossary-definition
---
{{GlossarySidebar}}
**CSS** (Cascading Style Sheets) is a declarative language that controls how webpages look in the {{glossary("browser")}}.
The browser applies CSS style declarations to selected elements to display them properly. A style declaration contains the properties and their values, which determine how a webpage looks.
CSS is one of the three core Web technologies, along with {{Glossary("HTML")}} and {{Glossary("JavaScript")}}. CSS usually styles {{Glossary("Element","HTML elements")}}, but can be also used with other markup languages like {{Glossary("SVG")}} or {{Glossary("XML")}}.
A CSS rule is a set of {{Glossary("property/CSS","properties")}} associated with a {{Glossary("CSS selector", "selector")}}. Here is an example that makes every HTML paragraph yellow against a black background:
```css
/* The selector "p" indicates that all paragraphs in the document will be affected by that rule */
p {
/* The "color" property defines the text color, in this case yellow. */
color: yellow;
/* The "background-color" property defines the background color, in this case black. */
background-color: black;
}
```
"Cascading" refers to the rules that govern how selectors are prioritized to change a page's appearance. This is a very important feature, since a complex website can have thousands of CSS rules.
## See also
- [Learn CSS](/en-US/docs/Learn/CSS)
- [The CSS documentation](/en-US/docs/Web/CSS)
- [CSS](https://en.wikipedia.org/wiki/CSS) on Wikipedia
- [The CSS Working Group current work](https://www.w3.org/Style/CSS/current-work)