Fixes positioning

Dan - this should fix the positioning issue.  We needed to do background-position: center center.

Can you:
a) merge these changes into your personal branch
b) refactor the background_style stuff so that it is in the public.sass stylesheet, since it's all static styling
c) rebase against master to squash into one nice commit
and 
d) submit a PR to merge into Originate/flms master and I'll give it a full review?

Good stuff.