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API reference docs for the React Box component. Learn about the props, CSS, and other APIs of this exported module.



import Box from '@mui/joy/Box';
// or
import { Box } from '@mui/joy';

Learn about the difference by reading this guide on minimizing bundle size.


Props of the native component are also available.


The component used for the root node. Either a string to use a HTML element or a component.

| object
| bool>
| func
| object

The system prop that allows defining system overrides as well as additional CSS styles.

See the `sx` page for more details.

As a CSS utility, the Box component also supports all system properties. You can use them as props directly on the component.

The ref is forwarded to the root element.

CSS classes

These class names are useful for styling with CSS. They are applied to the component's slots when specific states are triggered.

Class nameRule nameDescription
.MuiBox-rootrootClass name applied to the root element.

You can override the style of the component using one of these customization options: