Tabelle zentrieren

[BSA]

<table style="width:100%; height:100%;">
 <tr>
  <td>
   <div style="text-align:center; vertical-align:middle;">
    <table style="border:1px solid #ff0000;">
     <tr>
      <td>test</td>
    </tr>
   </table>
  </div>
 </td>
</tr>
</table>