I'm trying to use background image that would auto resize (width and height) to the size of browser (to any size). I've used the code below, however it doesn't work on smart phone (android). Width of image is done correctly, but height just doesn't want to auto resize. Everything works normally on laptop browsers though. Any suggestions how to solve this?

Code that I use:
HTML Code:
body {
	background: url(../images/grunge_background_mobile.jpg) no-repeat center center fixed;
	-webkit-background-size: cover;
	-moz-background-size: cover;
	-o-background-size: cover;
	background-size: cover;
	font-family: Verdana, Geneva, sans-serif;
	font-size: 12px;
Kind regards,