Topic: Mystery CSS rules

Developing locally on my Windows computer, my site shows the correct background-color property (light blue). After pushing to Heroku, the background-color is now white.

The app is at:
tranquil-atoll-5261.herokuapp.com

It's not clear to me where the new rule overriding my background color is coming from. I've searched my Rails directory and I can't find any CSS that would be overriding my desired background color. Is this related to the assets pipeline? Is there any way I can trace the source of the overriding CSS rules?

Re: Mystery CSS rules

Solved: an old stylesheet was in the precompiled assets. This problem was fixed with rake assets:precompile.