如何在material ui对话框组件上添加背景图像

import React from 'react';
import Dialog from '@material-ui/core/Dialog';
import DialogContent from '@material-ui/core/DialogContent';
import { makeStyles } from '@material-ui/core/styles';

const useStyles = makeStyles((theme) => ({
  dialog: {
    backgroundImage: 'url(背景图像的URL)',
    backgroundSize: 'cover',
    backgroundRepeat: 'no-repeat',
    backgroundPosition: 'center',
  },
}));

const MyDialog = () => {
  const classes = useStyles();

  return (
    <Dialog open={true}>
      <DialogContent className={classes.dialog}>
        {/* 对话框内容 */}
      </DialogContent>
    </Dialog>
  );
};