#bg
{
	
	position: center;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	}	

#bg img
{
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	margin: 20px;
	min-width: 50%;
	min-height: 50%;
}