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CSS is the language for describing the presentation of Web pages. This includes colors, layout, and font information, as well as how to change the presentation on different types of devices, such as those with large screens, small screens, or printers. CSS is independent of HTML and can be used with any XML-based markup language. The separation of HTML from CSS makes it easier to maintain the code, share style sheets across pages, and tailor pages to different environments. This is referred to as the separation of structure (or content) from presentation.