JSFiddle - React, Tailwind, and code Playground

HTML

<table width="600" align="center" cellpadding="0" cellspacing="0" border="0">
  <tr>
  <td align="center">Header</td>
  </tr>
  <tr>
    <td>
      <table width="600" align="center" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td width="60" align="center">1</td>
          <td width="60" align="center">2</td>
          <td width="60" align="center">3</td>
          <td width="60" align="center">4</td>
          <td width="60" align="center">5</td>
          <td width="60" align="center">6</td>
          <td width="60" align="center">7</td>
          <td width="60" align="center">8</td>
          <td width="60" align="center">9</td>
          <td width="60" align="center">10</td>
        </tr>
      </table>
    </td>
  </tr>
  <tr>
    <td height="10"><span style="font-size:1px">&nbsp;</span></td>
  </tr>
  <tr>
    <td height="300" align="center" bgcolor="888888">&nbsp;</td>
  </tr>
  <tr>
    <td height="10"><span style="font-size:1px">&nbsp;</span></td>
  </tr>
  <tr>
    <td height="30" align="center" bgcolor="888888">&nbsp;</td>
  </tr>
  <tr>
    <td height="10"><span style="font-size:1px">&nbsp;</span></td>
  </tr>
  <tr>
    <td>
      <table width="600" align="center" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td width="190" height="50" align="center" bgcolor="888888">1</td>
          <td width="15" align="center">&nbsp;</td>
          <td width="190" height="50" align="center" bgcolor="888888">2</td>
          <td width="15" align="center">&nbsp;</td>
          <td width="190" height="50" align="center" bgcolor="888888">3</td>
        </tr>
      </table>
    </td>
  </tr>
  <tr>
    <td height="10"><span style="font-size:1px">&nbsp;</span></td>
  </tr>
  <tr>
    <td>
      <table width="600" align="center" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td width="300">&nbsp;</td>
          <td width="300" bgcolor="888888">box</td>
        </tr>
      </table>
    </td>
  </tr>
</table>