.arrow {
  opacity: 0;
  position: absolute;
  left: 50%;
  top: 50%;
  transform-origin: 50% 50%;
  transform: translate3d(-50%, -50%, 0);
}
.arrow-first {
  animation: arrow-movement 2s ease-in-out infinite;
}
.arrow-second {
  animation: arrow-movement 2s 1s ease-in-out infinite;
}
.arrow:before, .arrow:after {
  background: #fff;
  content: '';
  display: block;
  height: 3px;
  position: absolute;
  top: 0;
  left: 0;
  width: 30px;
}
.arrow:before {
  transform: rotate(45deg) translateX(-23%);
  transform-origin: top left;
}
.arrow:after {
  transform: rotate(-45deg) translateX(23%);
  transform-origin: top right;
}
@keyframes arrow-movement {
  0% {
    opacity: 0;
    top: 45%;
  }
  70% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}