Procedure to obtain the background cover effect whichs works on small or large screens

cover-background

// Procedure to obtain the background cover effect whichs works on small or large screens

html {
	background: url(url_to_img) no-repeat center center fixed;
	background-size: cover;
	height: 100%;
	overflow: hidden;
}

body
{
	height:100%;
	overflow: scroll;
	-webkit-overflow-scrolling: touch;
	background: transparent;
}