CSS
Cascading Style Sheets.
In web development, Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML.
Source: http://en.wikipedia.org/wiki/Cascading_Style_Sheets
Read this HowTo:design-your-own-css-theme .
See also:
http://www.w3schools.com/css/
http://www.csszengarden.com/
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