#barraCarga {
  width: 0%;
  height: 4px;
  background-color: #3b82f6; /
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  transition: width 0.3s ease-in-out;
  visibility: hidden; 
}
#barraCarga.visible {
  visibility: visible;
}
#barraCarga.completa {
  width: 100%;
}