Not going to say it's my code because I'd seen something like this somewhere else...just can't remember. Anyhow, this is the code I came up with for my forum, and this is how I've finagled it to fit my SMF forum. Anything you see in red though you may need to change. (i.e. such as the rules themselves, I just figured it would be a nice template to get some ideas from.
<table border="0" cellpadding="10" cellspacing="2" width="920" class="bordercolor" align="center">
<tr>
<td width="25%" align="center" class="catbg" height="27">
About the Chat
</td>
<td width="75%" align="center" class="titlebg">
Chat
</td>
</td>
</tr>
<tr>
<td align="center" width="10%" class="windowbg2">
Welcome to the Chat Box! This spiffy lil' addon is powered by all those wonderful people at C-Box. We hope you enjoy using this feature, but before you get to talking it up, please look over these rules.
1. No Spamming.
2. No harsh swearing.
3. No Flaming.
4. Respect the C-Box...lurv the C-Box...
5. Have fun with it. Let us know if you're gonna be out, if there's a thread you'd like some feedback on, or make goofy faces =^.^=
Thank you all!
</td>
<td align="center" width="50%" class="windowbg2">
ADD YOUR C-BOX CODE HERE
</tr>
</table>
If you'd like a preview, at the bottom of my board you can see the C-Box and table in action.
http://redmoon.smfforfree2.com/index.php