Ask HN: How do I track down the HTML5 Rocks' Scrollbar source?

I really like the look of the scrollbars on HTML5 Rocks' home site under Mobile and Business (http://www.html5rocks.com/en/business) and I want to use them, or at least check out the code for inspiration on making my own.

That said, my usual route of inspecting the element (Chrome Development Tools), grabbing the relevant class or id, and then scouring scripts via Find has left me empty handed, in large part due to the minification making the scripts much harder to read, and my inability to find any js references to that "one_half" class that is applying the new sex.

Does anyone have any other strategies?