How do you make the edge of the container glow like the mybb.com's?
http://www.css3.info/preview/box-shadow/
You're welcome.
Quick:
Add this
-moz-box-shadow: 0 0 5px 5px #888;
-webkit-box-shadow: 0 0 5px 5px#888;
box-shadow: 0 0 5px 5px #888;
to your container and header css in your global.css stylesheet of your main theme.
Adjust settings as preferred.