<style>
.rbdashed {
border-top-width: 1px;
border-right-width: 1px;
border-bottom-width: 1px;
border-left-width: 1px;
border-top-style: dashed;
border-right-style: dashed;
border-bottom-style: dashed;
border-left-style: dashed;
border-top-color: #999999;
border-right-color: #999999;
border-bottom-color: #999999;
border-left-color: #999999;
}
</style>

<table class=rbdashed>
<tr> <td> afasdfafddafda </td> </tr>
</table>