CSS/Selectors/pseudo-classes/:root
Pseudo-classes :root
The :root pseudo-class represents an element that is the root of the document. In HTML, this is always the HTML element.
Syntax
selector:root{ properties }
Example
[style.css]
:root{ background-color: #ccc; }
[index.html]
<body> <p>This is a paragraph.</p> </body>
CSS defines the :root pseudo-class in 6.6.5.1. :root pseudo-class.