CSS (Cascading Style Sheets) is a stylesheet language used to describe the presentation of a document written in a markup language (like HTML or XML). Most commonly, it is used to style web pages.
Use Cascading Style Sheets to create and maintain web sites, or establish a strong foundation in CSS in order to communicate effectively with site designers and content specialists. Learn the concepts, techniques, properties, and values of CSS in a sequence that reflects a typical “building up” of design rules.