First method:
<style>table{ background-color: #000;}td{ background-color: #fff;}</style><table border="0" cellspacing="1" cellpadding="0"> <tr> <td>AAAAA</td> <td>aaaaa</td> </tr> <tr> <td>BBBBB</td> <td>bbbbb</td> </tr></table>
Second method:
<style>table{ border-collapse: collapse;}td{ border: 1px solid #000;}</style><table> <tr> <td>AAAAA</td> <td>aaaaa</td> </tr> <tr> <td>BBBBB</td> <td>bbbbb</td> </tr></table>