/*----------table----------*/
table.table {
border-spacing:2px;
border-collapse:separate;
background-color:#FFF;
border-color:gray;
border-style:outset;
border-width:1px;
}
table.table th {
background-color:#FFF;
-moz-border-radius:0;
border-color:gray;
border-style:inset;
border-width:1px;
padding:1px;
}
table.table td {
-moz-border-radius:0;
border-color:gray;
border-style:inset;
border-width:1px;
padding:1px;
}

<table class="table" border="1" width="200" align="center">
<tbody>
<tr>
<td>第1行第1列</td>
<td>第1行第2列</td>
</tr>
<tr>
<td>第2行第1列</td>
<td>第2行第2列</td>
</tr>
</tbody>
</table>

via:http://wange.im/insert-table-in-wordpress.html