Sidebar Widget Style

Hi Andrew,

Hope your OK.

Got an issue which I have been looking into for a little while which I could use your help with.
I have styled my side bar so each widget has the following CSS:

.sidebar #secondary {
  box-shadow: 0 5px 10px #a4a4a3;
  padding: 10px;
  border-radius: 5px;
  background-color: #ffffff;
  border-top: 1px solid #dbdbdb;
}

I wanted each widget to have the above CSS and not the whole sidebar, as at the moment it looks like this: http://www.stemcollege.co.uk/apply/
As you can see it has applied it to the whole sidebar, but I want it to style each widget individually like on your website.

Thanks in advance!
Tom