Slider Background is a stack that allows you to add a dynamically-resized, slideshow-capable background image to any page or element. We can have a single image or unlimited playing as a slideshow.
Do you see the full-sized background image on this page? In a nutshell, that's what Slider Background does. It will stretch any image to fit the page or block-level element, and will automatically resize as the window or element size changes.