Apply CSS to scrollUp

Hi there, Using the Audioman theme. I like it, lots of options. However I'm having trouble customizing the scrollUp icon. First I was trying to no avail to modify the To Top settings, eventually I realized I had to hide To Top because I was seeing 3 buttons. I realized reading one of the forums I was seeing the scrollUp feature. Which leads me to see that .scrollUp is not registered as the class of the scrollUp feature in your theme, because my CSS would not take effect. Can you tell me what $class to use to customize the scrollUp by CSS? I don't know where to look in the theme files to find the $class. All I saw on Theme Options is enable/disable. My domain is www.nednednerb.com __ Brenden