html, body{
		width: 100%;
		height: 100%;
		margin: 0;
		padding: 0;
		overflow: hidden;
		}
		#sfondo-css{
		position:absolute;
		height:100%;
		width: 100%;
		margin: 0;
		padding: 0;
		z-index: 1;
		}
		#css{
		position: absolute;
		z-index: 2;
		top:20px;
		left: 20px;
		color: white;
		overflow: auto;
		height: 100%;
		width: 50%;
		}
		#css a{
		color: white;
		}