Cascading Style Sheets (CSS)is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. and CSS is used for formatting structured. CSS offers more options and is more accurate and sophisticated. CSS is supported by all browser today. CSS was invented to remedy this situation by providing web designers with sopistecated layout oppurtunities suppoted by all browsers. at the sametime seperation of the presentation style of documents from the content of documents , makes site maintenance a lot easier.