Thank you. Before I go breaking things in templates - is that my only choice here? I made changes to small fonts in other areas by editing style properties. I had a feeling I might be able to do the same, for consistency's sake, in the style properties of "message layout" or "message elements". Am I barking up the wrong tree there?
I guess the proper way to ask this question is: Does a style property exist for the element I wish to change?
In the meantime, I made the change at messageMeta in message.css...