.oreo {
  position: absolute;
  z-index: 5;
  top: 0;
  left: 50%;
  margin: -601px 0 0 -500px;
  transition: all 0.4s ease-in-out;
  opacity: 0;
}
@media (max-width: 767px) {
  .oreo {
    margin: -560px 0 0 -500px;
    transform: scale(0.6);
  }
}

.sombra {
  pointer-events: none;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  position: absolute;
  opacity: 0.5;
  z-index: 1;
  top: -65%;
  left: 0;
  width: 100%;
  transition: all 0.4s ease-in-out;
  -webkit-animation: opacitySombra 3.3s ease-in-out infinite;
          animation: opacitySombra 3.3s ease-in-out infinite;
}
.sombra img {
  width: 100%;
}