how to display messages like in conversation using css

how to display messages like in conversation using css

I am trying to display the messages like in conversation using css,For
that I took two div's,one is for incoming messages and another div is for
sent messages , As of now I put like,
<table>
<tr>
<td><div id='sentMessages'></div></td>
<td><div id ='ReceivedMessages'></div></td>
</tr>
</table>
With this I am not able to display like in conversation,can u tell me how
to display like conversation?