Cascading Style Sheets

Cascading Style Sheets are a set of properties that allow web designers to apply specific styles to any XHTML element on a given web page. CSS is typically used to define colors, fonts, layout, and other aspects of document presentation.

Style Sheets are typically seperated from the XHTML in a web page so that the document content is separated from document presentation. This can improve content accessibility, flexibility and control the presentation.

Additionally, since the CSS is separated, it becomes relatively simple to update the design of the XHTML content without the need to redesign the XHTML from scratch.