body
{
	background-image:url("fondo.png");
	background-repeat:repeat-x;
	background:#3E618C;
}
#portada
{
position: absolute; 
height: 270px;
width: 600px; 
margin-left: -300px;
margin-top: -135px; 
left: 50%; 
top: 50%; 
}