What may be causing the MuiThemeProvider to override the style of a component?

Within my outer component, I am utilizing MuiThemeProvider:

<MuiThemeProvider theme={full_theme_e}>
    <div>
    <AppBar />
    <Filter />
    </div>
</MuiThemeProvider>

Inside the Filter component, I have specified a custom style:

const styles = {
  expansionPanel: {
    borderTopLeftRadius: 0,
    borderTopRightRadius: 0,
    borderBottomLeftRadius: 0,
    borderBottomRightRadius: 0,
  }
};

This style is applied to the component like so:

<ExpansionPanel className={classNames(classes.expansionPanel, className)}

Finally, in my export statement, I incorporate the style using withStyles:

export default withStyles(styles)(Filter);

The issue arises when my customized style conflicts with the styling from MuiThemeProvider. Why is this happening? https://i.sstatic.net/6S6G7.png

Answer №1

const styles = {
  cardStyles: {
    '&:first-child': {
      borderTopLeftRadius: 0,
      borderTopRightRadius: 0,
      borderBottomLeftRadius: 0,
      borderBottomRightRadius: 0,
    }
  }
};

Similarly for :last-child, :nth-child...

Explanation on how to use CSS colon selectors:

'&:[selector]': {
  ...
}

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