The :root CSS pseudo-class matches the root element of a tree representing the document. In HTML, :root represents the <html> element and is identical to the selector html, except that its specificity is higher.
/* Selects the root element of the document:
<html> in the case of HTML */
:root {
background: yellow;
}
Syntax
:root {
/* ... */
}
Examples
Declaring global CSS variables
:root can be useful for declaring global CSS variables:
:root {
--main-color: hotpink;
--pane-padding: 5px 42px;
}