.portada {
  color: white;
  background-image: url("../img/portada.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  height: 100vh;
}

.portada2 {
  color: white;
  background-image: url("../img/portada2.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  height: 100vh;
}

.portada3 {
  color: black;
  background-image: url("../img/fondo_programa.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
.texto-vertical {
    writing-mode: vertical-lr;
    transform: rotate(180deg);
}