CSS Background always fill all available space

I've been trying to do this for absolutely forever - have a background image that always covers the screen, regardless of the size or orientation of the screen, and with no visible space. I finally found out how to do it using nothing but CSS applied to the body, so here it is!body{background-color:#444444;background: url("/public/img/imageName.png") no-repeat center center fixed;-webkit-background-size: cover;-moz-background-size: cover;-o-background-size: cover;background-size: cover;}