Positioning a background image is not always an easy task for responsive sites because its correct visualization depends on the behavior of its contents.
Just to clarify, let me show you a sample of this problem:
The problem is that sometimes we fix the content to keep the background still correct and it needs to change. There are two plugins that help a lot in positioning this background: Anystretch and Backstretch.
Anystretch is a jQuery plugin that allows you to add a dynamically-resized background image to any page or block-level element. Originally, ...