.visor-modal {
  display: none;
  position: fixed;
  z-index: 10000;
  padding-top: 50px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.9);
  text-align: center;
}

.visor-contenido {
  max-width: 90%;
  max-height: 80%;
}

#cerrarVisor {
  position: absolute;
  top: 20px;
  right: 40px;
  color: #fff;
  font-size: 40px;
  cursor: pointer;
}

.volver-btn {
  margin-top: 20px;
}