Module Class Suffix FOnt Reduction Using Corporate 2 Template

In my U.S. Markets module on http://www.tradeumbrella.com, there is a setting called "Module Class Suffix". For the Corporate 2 template, what information do I enter here? My goal for this is to reduce the size of the font using CSS here in this setting so that it fits inside of the module position. Any ideas on what I enter here or how to do this?

Thanks!