如何在reactjs中使用material-ui只显示登录页面？

npm install react react-dom @material-ui/core

import React from 'react';
import { makeStyles } from '@material-ui/core/styles';
import { Container, TextField, Button } from '@material-ui/core';

const useStyles = makeStyles((theme) => ({
  container: {
    display: 'flex',
    flexDirection: 'column',
    alignItems: 'center',
    marginTop: theme.spacing(8),
  },
  textField: {
    marginBottom: theme.spacing(2),
  },
  button: {
    marginTop: theme.spacing(2),
  },
}));

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

  return (
    <Container maxWidth="xs" className={classes.container}>
      <TextField
        label="Username"
        variant="outlined"
        className={classes.textField}
      />
      <TextField
        label="Password"
        type="password"
        variant="outlined"
        className={classes.textField}
      />
      <Button
        variant="contained"
        color="primary"
        className={classes.button}
      >
        Login
      </Button>
    </Container>
  );
};

export default Login;

import React from 'react';
import ReactDOM from 'react-dom';
import Login from './Login';

ReactDOM.render(<Login />, document.getElementById('root'));