the css can be found in the source, or at style.css, but you will find only a message and no address for the font.
The method is described a bit on our blog, subjective object
To use it, put your font files in /fonts instead of the Goudy Bookletter 1911 ones, and edit the spify_*.php files to reflect that change.
This code is distributed without guarantees of security and without the promise of support. It works for me, I hope it works for you. Leave updates, suggestions, or questions in the comments of the above-mentioned post.