Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup languagelike HTML.[1] CSS is a cornerstone technology of the Worl Wide Web, alongside HTML and JavaScript.[2] CSS is designed to enable the separation of presentation and content, including layout, colors, and fonts.[3] This separation can improve accesibility, provid more flexibility and control in the specification of presentation characteristics, enable multiple web pages to share formatting by specifying the relevant CSS in a separate .css file, and reduce complexity and repetition in the structural content.