Revamp Material UI Expansion Panel Summary

expansionPanelSummary: {
        content: {
            "& > :last-child": {
                paddingRight: 0
            }
        },
        expandIcon: {
            top: "80%"
        }
    }

I'm attempting to customize the styles of Material UI Expansion Panel Component without success.

<ExpansionPanelSummary
                    expandIcon={<ExpandMoreIcon color="primary" />}
                    classes={{ content: classes.expansionPanelSummary.content, expandIcon: classes.expansionPanelSummary.expandIcon}}
                >

I'm unable to override it at a theme level because this component is used elsewhere with default settings.

reactjsmaterial-uijss

Answer №1

It seems that an extra level ("expansionPanelSummary") has been added to the styles object, which is not valid. The top-level properties in the styles object passed to withStyles will be converted into classes. For instance, classes.expansionPanelSummary would generate a classname via JSS, whereas 

classes.expansionPanelSummary.content
would not.

Here is an example of the correct syntax:

// Import necessary components
// Define styles using withStyles
// Create a functional component

I adjusted the paddingRight to 100 for visibility when testing the effect.

View the CodeSandbox link for demonstration:

https://codesandbox.io/s/nkn7mo55kl

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