Post Header Size

I've been working with the Simple Catch theme and love it for the project Im working on. I was wondering how to change the size of the font in the post headlines seen here: http://chautauqualakeassociation.org/testing/?cat=7 The headlines are gigantic and look a little weird. I can't seem to find where to alter this. To be clear, the text that reads "EVENT: 2013 NYS Ice Fishing Pro-Am Tournament – February 15-17, 2013" is too large and I would like it smaller.