text: import * as React from 'react';
  import { DataGrid } from '@mui/x-data-grid';
  import { makeStyles } from '@material-ui/styles';
  
  const columns = [
    {
      field: 'first',
      headerClassName: 'super-app-theme--header',
      headerAlign: 'center',
      width: 140,
    },
    {
      field: 'last',
      headerClassName: 'super-app-theme--header',
      headerAlign: 'center',
      width: 140,
    },
  ];
  
  const rows = [
    {
      id: 1,
      first: 'Jane',
      last: 'Carter',
    },
    {
      id: 2,
      first: 'Jack',
      last: 'Smith',
    },
    {
      id: 3,
      first: 'Gill',
      last: 'Martin',
    },
  ];
  
  const useStyles = makeStyles({
    root: {
      '& .super-app-theme--header': {
        backgroundColor: 'rgba(255, 7, 0, 0.55)',
      },
    },
  });
  
  export default function StylingHeaderGrid() {
    const classes = useStyles();
  
    return (
      <div style={{ height: 300, width: '100%' }} className={classes.root}>
        <DataGrid rows={rows} columns={columns} />
      </div>
    );
  }
  