**CSS**

CSS (Cascading Style Sheets) is a style sheet language used for describing the look and formatting of a document written in a markup language. Its primary use is in documents written in HTML and XHTML, but can also be applied to any kind of XML document.
Installation and Configuration

  *  CSS does not require installation or configuration.

Usage

  *  A comprehensive CSS reference, including tutorials and syntax, can be found at http://www.w3schools.com/css/