main>.bloque:nth-child(2)>article>#contenedorPosts>a:nth-child(1)>div
{
	background-image: url("../posts/Quien soy yo/img/cabecera.jpg");
	background-size: 15em;
	background-position-x: 0px;
}
main>.bloque:nth-child(2)>article>#contenedorPosts>a:nth-child(2)>div
{
	background-image: url("../posts/La programacion/img/cabecera.jpg");
  background-size: 15em;
}