Output does not look like sample

[jvsteiner]

I'm sure I'm doing something wrong, but I can't figure out what it is. My test letter outputs like the below:

As you can see, it looks like the bog standard style - no fonts, etc. not like the sample pdf provided in the repository. I'm sure the template is getting picked up, because all the frontmatter YAML stuff is getting put in the right places - the structure of the letter looks right, but the style is off. Any ideas?

Thanks!