如何在MUI v5中使内容组件显示在AppBar下方

import React from 'react';
import { AppBar, Toolbar, Typography } from '@mui/material';

const App = () => {
  return (
    <div>
      <AppBar position="fixed">
        <Toolbar>
          <Typography variant="h6">My App</Typography>
        </Toolbar>
      </AppBar>
      <div style={{ marginTop: '64px' }}>
        {/* 内容组件 */}
      </div>
    </div>
  );
};

export default App;