css - Rails app - Referencing images within a stylesheet -

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so i'm working on new rails app, , within 1 of stylesheets have pg-parlex class specifies background-image link:

.bg-parlex {     padding-top: 0px;     background-image: url('assets/banner-bg.gif'); /* << url link! */     background-size: cover;     background-repeat: no-repeat;     background-attachment: fixed; }

could explain how link assets/images folder items within...i sure assets/item1.png or assets/item2.png, perhaps link inside stylesheet maybe wrong...?

you can use: 

background-image: image-url("rails.png")  #=> background-image: url(/assets/rails.png)

if using sass-rails gem:

background-image: asset-url("rails.png", image)  #=> background-image: url(/assets/rails.png)

so, code be:

.bg-parlex {     ...     background-image: asset-url("banner-bg.gif", image);     ... }

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