Changing the font style on a button

How do I change the font size on a button. I have added a GUIStyle which I can assign to a button but when I do the button looses the box outline around the button so it looks like text instead of a button (but it still works like a button)? This does change the font size but I still need the button to look like a button.

Jason

Create your initial guistyle with

 var buttonStyle = new GUIStyle("button");

Then change the font size.