Are you sure your URL is 70.85? I don't think that's right, or in any case, I can't open it.
Chances are if your footer's width is restricted, it's inside a box with restricted width. Sometimes templates like from WordPress will just be extra redundant for the sake of redundant redundancy for redundancy, and also for m0aR better code bloat. But that width may have been doing nothing all along.
If you have something like
then footer won't be able to get any wider than mainpagebox.
So if that's the case (I don't know), you would have to move the footer out. You could try placing the whole footer right before the closing </body> tag, however I haven't seen your code so this may be way off. But generally that's what full-width things do if they are on a page with limited width.