html {
   min-height: 100%;
   background-image: url('/images/background.jpg');
   background-size: cover;
   background-repeat: no-repeat;
   background-position: center center;
}



#main {
	width: 700px;
    height: 500px;
    
    
    position: absolute;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    
    margin: auto;
	text-align: center;
}

#main img {
	
	height: 100%;
}