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Cascading Style Sheets (CSS) is one of the main technologies of the web, along with HTML and JavaScript. It is a style sheet language that describes the appearance of a document written in HTML.

CSS separates presentation (the colours, fonts and layout of a document) from content, improving accessibility, control and flexibility. Many web pages can share formatting by specifying the relevant CSS in a separate .css file, reducing complexity and repetition in structure. CSS can also be stored or cached in the browser, improving page load speed between pages that share the file.