Change Site Slogan Font Size in Network Theme

Hey there...this one's probably for you Tammi :slight_smile: I would like to change the size of the font where my site slogan is (using network theme). You can view it at http://www.tutuology.com. The slogan says: The world's online wholesale & retail tutu princess girly girl couture marketplace and business platform. Can this easily be done by modifying a file in network theme? Many Thanks!