Name Type Default Description
children node   The content of the expansion panel summary.
classes object   Override or extend the styles applied to the component. See CSS API below for more details.
expandIcon node   The icon to display as the expand indicator.

Any other properties supplied will be spread to the root element (ButtonBase).


You can override all the class names injected by Material-UI thanks to the classes property. This property accepts the following keys:

  • root
  • expanded
  • focused
  • disabled
  • content
  • expandIcon

Have a look at overriding with classes section and the implementation of the component for more detail.

If using the overrides key of the theme as documented here, you need to use the following style sheet name: MuiExpansionPanelSummary.


The properties of the ButtonBase component are also available. You can take advantage of this behavior to target nested components.