Line in Firefox background

Problem

When scaling the FireFox and having a background image size set to 100%, the bottom of the image sometimes shows a line on the bottom showing the background behind it.

Solution

Firefox seems to have a problem with background-size: 100%.  instead use background-size: 99.99%;

http://stackoverflow.com/questions/18423884/flickering-line-under-background-image-in-firefox-on-resize