Rails: How to set a background image in rails from css?

In your CSS:

background-image: url(background.jpg);

or

background-image: url(/assets/background.jpg);

In environments/production.rb:

# Disable Rails's static asset server (Apache or nginx will already do this)  
config.serve_static_assets = false

# Compress JavaScripts and CSS  
config.assets.compress = true

# Don't fallback to assets pipeline if a precompiled asset is missed  
config.assets.compile = false

# Generate digests for assets URLs  
config.assets.digest = true