* {
	margin: 0;
	padding: 0;
}
 
html {
	height:100%;
	min-height:100%;
	overflow: hidden;
}

body {
	height:100%;
    background-image: url(bg.gif);
    background-size: cover;
    background-position: center center;
}

header {
    display: block;
    width: 1px;
    height: 1px;
    overflow: hidden;
}