Merge "Change default work challenge background color" into nyc-dev am: 30fb053
am: 3fcd1e7

* commit '3fcd1e74f45fd6a5a0ba8ee44d1a8b41204bfaa9':
  Change default work challenge background color

Change-Id: Ie7e8dc153d2486c10cefcc004598cbb4009e6a31