First pass on footer mobile fix

- hide the original and replace with a container
- make better use of bootstrap utilities
- yay css
4 jobs for 112-footer-fix in 1 minute and 41 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #2578
Go-py2.7

00:01:39

passed #2579
Go-py3.4

00:01:40

passed #2580
Go-py3.5

00:01:41

passed #2581
Go-py3.6

00:01:37