change bg color to footer color

[nmorduch]

closes #68

[harrislapiroff]

This looks pretty good, if a little odd if the display is long and/or the page is short. I wonder if a better solution in the future might just be to abandon the sticky footer.

Merging for now, though.

[nmorduch]

oops yeah we should also abandon the sticky footer. i would never have written it tbh

[harrislapiroff]

you must be a better designer than me ¯_(ツ)_/¯

[nmorduch]

no i mean it's a good design idea, it's just messy to execute, i think. lots of edge cases. i would never have written it because i am lazy.