Image caption adjusting

I'm trying to change the caption font size. I thought it would be as easy as going to:
Appearance -> Atahulupa Theme Options -> Style images -> Caption text: style
But that hasn't worked. I had a friend set up the site and do some customizing and unfortunately, I wasn't able to understand it all and so I'm not sure if something was customized in a place I can't find it. Below is what the caption text: style shows it to be. It appears that we made the changes from this box, because the default is different. But, I'm not able to get it to change when I change the 0.5em size. I even tried changing the line-height thinking that it was expanding to fit that.

font-size: 0.5em;
line-height: 13px;
padding: 2px 4px 5px;
margin: 0;
color: #666666;

Default: font-size: 0.8em; line-height: 13px; padding: 2px 4px 5px; margin: 0; color: #666666;

I'm tried uploading the customized file copied as a Word doc but wasn't successful. I couldn't find anything about caption styling on it, but since I'm so new to this theme and did not to the customizing, maybe I'm missing something. If you need this info, I can copy it into the body of a message.

The website I'm working on is driftlessprairies.org

Thanks for your help! It is much appreciated.