JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<table id="tableHeader">
  <tr>
    <th>Header</th>
    <th>Header</th>
  </tr>
</table>
<div class="datacontainer">
  <table>
    <tr>
      <td>stuff</td>
      <td>stuff</td>
    </tr>
        <tr>
      <td>stuff</td>
      <td>stuff</td>
    </tr>    <tr>
      <td>stuff</td>
      <td>stuff</td>
    </tr>    <tr>
      <td>stuff</td>
      <td>stuff</td>
    </tr>    <tr>
      <td>stuff</td>
      <td>stuff</td>
    </tr>
          <tr>
      <td>stuff</td>
      <td>stuff</td>
    </tr>
  </table>
</div>
</body>

CSS

th{
    width: 100px;
    background-color: #CCC;
}

.datacontainer{
    height: 250px; 
    overflow:auto; 
    width:250px 
}

td{
    height: 50px;
    width: 100px;
    background-color: #DDD;
}