You can put them either by the use of <div> or <table>
If by <div>, you can contain them one each per box.
[quote]<div style="border: 1px solid #000000; width: 400px; height: 500px;">
[i]Your contents here[/i]
</div>
<div style="border: 1px solid #000000; width: 400px; height: 500px;">
[i]Another contents here[/i]
</div>[/quote]
If by <table>, it's quite complicated than <div>
[quote]<table align="center" width="400px" border="1">
<tr>
<td height="500">[i]Your contents here[/i]</td>
</tr>
<tr>
<td height="300">[i]Another contents here[/i]</td>
</tr>
</table>[/quote]
As you can see, <tr></tr> is use to contain a block(s) [row] or cell [<td></td>].
The cells <td></td> are the containers of the contents.
You can not set the table's height if you put the height="" attribute inside the table tag <table> so you have to put the height="" attribute in the cells <td height="250">
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There are many differences of <div> from <table> (or vice versa).
Like for example, Tables does not support scrollbars.
Div does not support cells, so you have to use another div inside the div, or use other tags inside the div.
Learn more about HTML in
www.w3schools.com for more info.