If you’re trying to place a shadow around the wrap, you’ll first need to add a width (if you haven’t already). Then you can apply the css to it. Here is how the other site you linked to is doing it – box-shadow: 0 0 20px #333333;
You can also Google how to add box-shadows. I came across this – http://css-tricks.com/snippets/css/css-box-shadow/ and there are plenty more.