As in fixed so it's always visible when you scroll up and down? I think I may have accidentally found a way of doing it when trying to fix my own footer issue.
I'm not sure if that's the best way or if that's what you wanted - all I know is that when I have that in the footercontainer CSS, it's fixed in place at the bottom of the screen and all content is scrolled underneath.
I should note, that the same seems to work on the header too, only you use top instead of bottom, and I applied a z-index to prevent the content from overlapping
Again, I can't say if this is the proper way of doing it - I found this by mistake ^^