<!DOCTYPE html>
<style>
  /* In border-collapse mode, outset becomes groove. */
  table { border-collapse: collapse; }
  table, td { border-style: outset; }
  td { border-width: 20px; width: 100px; height: 100px}
</style>
<table>
  <tr>
    <td></td>
  </tr>
</table>