#centrado
{
  	position: inherit;
 	top: 50%;
 	left: 50%;
  	margin-left: -490px;
	margin-top: -285px;

}
#background
{
	position:absolute;
 	top: 50%;
 	left: 50%;
  	margin-left: -1012px;
	margin-top: -750px;
}