Rails: How to reference images in CSS within Rails 4

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Sprockets together with Sass has some nifty helpers you can use to get the job done. Sprockets will only process these helpers if your stylesheet file extensions are either .css.scss or .css.sass.

Image specific helper:

background-image: image-url("logo.png")

Agnostic helper:

background-image: asset-url("logo.png", image)
background-image: asset-url($asset, $asset-type)

Or if you want to embed the image data in the css file:

background-image: asset-data-url("logo.png")

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