How can I make icon small when using bootstrap?

If I want to minimize icon size, how can I make icon small when using bootstrap?

This is demo http://jsfiddle.net/AqUBu/

I'd like to minimize the size of this human icon.

<span class='badge badge-success'><i class='icon-user icon-white'></i><i class='icon-user icon-white'></i><i class='icon-user icon-white'></i></span>