w3 css code example

Example 1: css in html

<!-- EXAMPLE -->
<div class="your_class" style="display:none">

<!--[SYNTAX: style="<CSS-code>"] -->

Example 2: css

Cascading Style Sheets is a style sheet language used for describing the
presentation of a document written in a markup language like HTML.

CSS is a cornerstone technology of the World Wide Web, alongside HTML and
JavaScript.