div.pantalla
{
	position: absolute;
	
	left: 10px;
	top: 10px;
	
	width: 770px;
	height:540px;
	
	background-image:url('../img/fondo.png');
	background-repeat:no-repeat;
	background-position:center center;
	
	box-shadow: 2px 2px 2px rgba(0,0,0,0.75);

}

a.button
{
	position: absolute;
	top: 30px;
	right: 20px;
}

img.ejemplo
{
	width: 150px;
}