Trying to modify the compliments module font, but 'thin' shows up out of nowhere

[fribse]

I’ve tried setting classes for the compliments module to:

classes: 'bold xlarge bright complimenttime',

Where the last is for MMM-ModuleScheduler

But when it shows up, I see this for the module:

class="thin xlarge bright pre-line"

Where on earth is ‘thin’ from, and where is the bold?