Cascading Style Sheets (CSS) is a style sheet language used for describing the look and formatting of a document written in a markup language.

     While most often used to style web pages and interfaces written in HTML and XHTML, the language can be applied to any kind of XML document, including plain XML, SVG and XUL.

     CSS is designed primarily to enable the separation of document content from document presentation, including elements such as the layout, colors, and fonts.

     This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, enable multiple pages to share formatting, and reduce complexity and repetition in the structural content (such as by allowing for tableless web design)