Filename extensions: css

A cascading style sheet file is used to define a cascading style sheet for a web page. The purpose is to provide more control over the fonts, colors, layout, etc. that go into the web page than could be provided by raw HTML. Also, since the cascading style sheet file is separate from the HTML files, it can be shared (or even inherited; a little outside the scope of this document) by multiple web pages to help provide a consistent look-and-feel across a web site. It is not yet fully supported by all browsers; newer versions of all popular browsers do provide some CSS support, however.