CSS

Cascading Style Sheets (CSS) is the styling language developed by the W3C for use in conjunction with a markup language such as HTML or XHTML. Its power is in the fact that the information can be stored in various scopes, and the cumulative effect of all styling rules is computed before rendering the final design in the browser. When used with sufficiently semantic markup, it is a very flexible way to completely style a website, separating the presentational details from the content itself.