css ile tam ekran background yapma

body {
	background-image: url(style2/body-bg.png);
	background-color: #2d2d2d;
	color: #474747;
}

<style>
body {
    background-image:url("http://i.imgur.com/qNPA4co.jpg");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
html {
    height: 100%
}
</style>

background: url(../images/bg.jpg) no-repeat center center fixed; -moz-background-size: cover;-o-background-size: cover;background-size: cover;