How can I reference CSS background images in production in Rails 4.0?

Question

I switched an app over from 3.2.12 to 4.0.0.rc1. When I viewed it in production afterwards, the background image had disappeared. The rest of my image assets were fetched with n

Answer 1

Use asset-url. Rails will preprocess this and expand the proper url.

body {
  background-image: asset-url('background.png');
  background-attachment: fixed;
  background-position: 100% 100%;
  background-repeat: no-repeat;
}