:root

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.

css
/* Selects the root element of the document:
   <html> in the case of HTML */
:root {
  background: yellow;
}

Syntax

css
:root {
  /* ... */
}

Examples

Declaring global CSS variables

:root can be useful for declaring global CSS variables:

css
:root {
  --main-color: hotpink;
  --pane-padding: 5px 42px;
}

Specifications

Specification
Selectors Level 4
# root-pseudo

Browser compatibility

Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
:root

See also