XF 2.0 Header that scrolls with content?


Hey all. Haven't seen a similar question so perhaps I'm not even phrasing it correctly. I'v seen a few XF forums where this part:


Stays at the top of the screen while you scroll down, so that those links are always available even at the bottom of the page. Is this a setting that I can't find or is this a custom implementation? If the latter, how do I do it?