[Seaside] Adding @font-face to a CSS style sheet in Seaside

[Lawrence Kellogg]

Hello,
  I'm trying to use the @font-face command like this one: 

@font-face { 
	font-family: Chunkfive;
	src: url('Chunkfive.otf);
}

from here: 

http://sixrevisions.com/css/font-face-guide/

but I don't understand how to add this to my existing stylesheet. 
Do I use some attributes from the updateRoot: method? 

I have an existing stylesheet stored in a FileLibrary and I specify it in 
my updateRoot: method:
 
anHtmlRoot stylesheet url: UserFileLibrary / #myStyleCss

How do I generate the call to font-face to use the custom font that 
I have stored in a file library? 

  Thanks, 

  Larry