.cube-loader {
  position: relative;
  /* u can choose any size */
  width: 75px;
  height: 75px;
  transform-style: preserve-3d;
  transform: rotateX(-30deg);
  animation: animate 4s linear infinite;
}

@keyframes animate {
  0% {
    transform: rotateX(-30deg) rotateY(0);
  }

  100% {
    transform: rotateX(-30deg) rotateY(360deg);
  }
}

.cube-loader .cube-wrapper {
  position: absolute;
  width: 100%;
  height: 100%;
    /* top: 0;
    left: 0; */
  transform-style: preserve-3d;
}

.cube-loader .cube-wrapper .cube-span {
  position: absolute;
  width: 100%;
  height: 100%;
    /* top: 0;
    left: 0; */
                                       /* width 75px / 2 = 37.5px */
  transform: rotateY(calc(90deg * var(--i))) translateZ(37.5px);
  background: linear-gradient(
      to bottom,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%,
      hsl(176.89, 99.07%, 58.04%) 100%
    );
}

.cube-top {
  position: absolute;
  width: 75px;
  height: 75px;
  background: hsl(176.89, 99.07%, 58.04%) 100%;
                        /* width 75px / 2 = 37.5px */
  transform: rotateX(90deg) translateZ(37.5px);
  transform-style: preserve-3d;
}

.cube-top::before {
  content: '';
  position: absolute;
  /* u can choose any size */
  width: 75px;
  height: 75px;
  background: hsl(176.61, 42.28%, 40.7%) 19.6%;
  transform: translateZ(-90px);
  filter: blur(10px);
  box-shadow: 0 0 10px #323232,
                0 0 20px hsl(176.61, 42.28%, 40.7%) 19.6%,
                0 0 30px #323232,
                0 0 40px hsl(176.61, 42.28%, 40.7%) 19.6%;
}