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filename: /packages/material-ui/src/CircularProgress/CircularProgress.js
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# CircularProgress

## ARIA

If the progress bar is describing the loading progress of a particular region of a page,
you should use `aria-describedby` to point to the progress bar, and set the `aria-busy`
attribute to `true` on that region until it has finished loading.

## Props

| Name | Type | Default | Description |
|:-----|:-----|:--------|:------------|
| <span class="prop-name">classes</span> | <span class="prop-type">object |  | Override or extend the styles applied to the component. See [CSS API](#css-api) below for more details. |
| <span class="prop-name">color</span> | <span class="prop-type">enum:&nbsp;'primary'&nbsp;&#124;<br>&nbsp;'secondary'&nbsp;&#124;<br>&nbsp;'inherit'<br> | <span class="prop-default">'primary'</span> | The color of the component. It supports those theme colors that make sense for this component. |
| <span class="prop-name">size</span> | <span class="prop-type">union:&nbsp;number&nbsp;&#124;<br>&nbsp;string<br> | <span class="prop-default">40</span> | The size of the circle. |
| <span class="prop-name">thickness</span> | <span class="prop-type">number | <span class="prop-default">3.6</span> | The thickness of the circle. |
| <span class="prop-name">value</span> | <span class="prop-type">number | <span class="prop-default">0</span> | The value of the progress indicator for the determinate and static variants. Value between 0 and 100. |
| <span class="prop-name">variant</span> | <span class="prop-type">enum:&nbsp;'determinate'&nbsp;&#124;<br>&nbsp;'indeterminate'&nbsp;&#124;<br>&nbsp;'static'<br> | <span class="prop-default">'indeterminate'</span> | The variant of progress indicator. Use indeterminate when there is no progress value. |

Any other properties supplied will be [spread to the root element](/guides/api#spread).

## CSS API

You can override all the class names injected by Material-UI thanks to the `classes` property.
This property accepts the following keys:
- `root`
- `static`
- `indeterminate`
- `colorPrimary`
- `colorSecondary`
- `svg`
- `circle`
- `circleStatic`
- `circleIndeterminate`

Have a look at [overriding with classes](/customization/overrides#overriding-with-classes) section
and the [implementation of the component](https://github.com/mui-org/material-ui/tree/master/packages/material-ui/src/CircularProgress/CircularProgress.js)
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: `MuiCircularProgress`.

## Demos

- [Progress](/demos/progress)

