.loader {
  --size: 100px;
  width: var(--size);
  height: var(--size);
  position: absolute;
  top: 35%;
  left: 50%;
  transform-origin: 50% 100%;
  transform-style: preserve-3d;
  perspective: 5000px;
  animation: rotar 10s linear infinite alternate both;

  .side {
    width: var(--size);
    height: var(--size);
    position: absolute;
    background: repeating-linear-gradient(
        to right,
        transparent 1% 9%,
        #0f0 9% 10%
      ),
      repeating-linear-gradient(to top, transparent 1% 9%, #0f0 9% 10%);
    background-color: #0008;
  }

  .behind {
    transform: translateZ(calc(-1 * var(--size)));
  }

  .right {
    transform-origin: 100% 50%;
    transform: rotateY(-90deg);
  }

  .left {
    transform-origin: 0% 50%;
    transform: rotateY(90deg);
  }

  .top {
    transform-origin: 50% 0;
    transform: rotateX(-90deg);
  }

  .bottom {
    transform-origin: 50% 100%;
    transform: rotateX(90deg);
  }
}

@keyframes rotar {
  0% {
    transform: translate(-50%, -50%) rotateX(0deg) rotateY(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotateX(360deg) rotateY(360deg);
  }
}