External Styling and Selectors Advanced users of CSS rarely add their styling to an individual page. Instead, veteran users deploy CSS through an external .css file that each page refers to as needed.

Learn how cascading style sheets (CSS) work, and how they can help you properly create HTML page layouts that conform to industry best practices.

How does CSS work? CSS is a language that is used to style HTML documents. This language can be used to create both simple and complex websites.