We use HTML to specify the structure of the page, and use Cascading Style Sheets (CSS) to specify the appearance. The CSS style rules may be embedded within the HTML code of the body (but this mostly defeats the purpose of using CSS).

How to Style a Page Using CSS. CSS(Cascading Style Sheets) is a web language used in partnership with HTML or XHTML. It is used to add presentational effect and style to webpages coded in (X)HTML(referring to both HTML and XHTML).