Crafty.background()

src/graphics/drawing.js#L4-L21
public void Crafty.background(String style)
style

Modify the background with a color or image

This method is a shortcut for adding a background style to the stage element, i.e. Crafty.stage.elem.style.background = ...

For example, if you want the background to be white, with an image in the center, you might use:

Crafty.background('#FFFFFF url(landscape.png) no-repeat center center');