Check this fiddle. You are going to need to take a look at using border-collapse and border-spacing. There are some quirks for IE (as usual). This is based on an answer to this question.
table.test td {
background-color: lime;
margin: 12px 12px 12px 12px;
padding: 12px 12px 12px 12px;
}
table.test {
border-collapse: separate;
border-spacing: 10px;
*border-collapse: expression('separate', cellSpacing='10px');
}
_x000D_
<table class="test">
<tr>
<td>Cell</td>
<td>Cell</td>
<td>Cell</td>
</tr>
<tr>
<td>Cell</td>
<td>Cell</td>
<td>Cell</td>
</tr>
<tr>
<td>Cell</td>
<td>Cell</td>
<td>Cell</td>
</tr>
</table>
_x000D_