modify index.html

==

 import React from 'react';

import ReactDOM from 'react-dom/client';

const myelement = (

  <table>

    <tr>

      <th>Name</th>

    </tr>

    <tr>

      <td>John</td>

    </tr>

    <tr>

      <td>Elsa</td>

    </tr>

  </table>

);

const container = document.getElementById('sandy');

const root = ReactDOM.createRoot(container);

root.render(myelement);

=

 <header id="sandy"></header>

=