What is the way to replace the default color of mui/material/Tab font (react)?

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You can use the makeStyles function from @material-ui/core/styles to create custom styles for your Tab component and use the color property to set a new font color. Here's an example code:

import { makeStyles } from '@material-ui/core/styles';
import { Tab } from '@material-ui/core';

const useStyles = makeStyles((theme) => ({
  myCustomTab: {
    color: 'red', // set your desired font color here
  },
}));

function MyComponent() {
  const classes = useStyles();

  return (
    <Tab label="My Tab" className={classes.myCustomTab} />
  );
}

In this example, the myCustomTab style class is created with a color property set to 'red'. Then, the Tab component is rendered with the myCustomTab class name applied to it.