# Paper ## Props | Name | Type | Default | Description | |:-----|:-----|:--------|:------------| | classes | Object | | Useful to extend the style applied to components. | | component | union: string
 Function
| 'div' | The component used for the root node. Either a string to use a DOM element or a component. | | elevation | number | 2 | Shadow depth, corresponds to `dp` in the spec. It's accepting values between 0 and 24 inclusive. | | square | boolean | false | If `true`, rounded corners are disabled. | Any other properties supplied will be spread to the root element. ## CSS API You can overrides all the class names injected by Material-UI thanks to the `classes` property. This property accepts the following keys: - `root` - `rounded` - `shadow0` - `shadow1` - `shadow2` - `shadow3` - `shadow4` - `shadow5` - `shadow6` - `shadow7` - `shadow8` - `shadow9` - `shadow10` - `shadow11` - `shadow12` - `shadow13` - `shadow14` - `shadow15` - `shadow16` - `shadow17` - `shadow18` - `shadow19` - `shadow20` - `shadow21` - `shadow22` - `shadow23` - `shadow24` Have a look at [overriding with class names](/customization/overrides#overriding-with-class-names) section for more detail. If using the `overrides` key of the theme as documented [here](/customization/themes#customizing-all-instances-of-a-component-type), you need to use the following style sheet name: `MuiPaper`.