.cube {
  position: relative;
  height: 100px;
  width: 100px;
  transform-style: preserve-3d;
  animation: animate 4s linear infinite;
}

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

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

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

.cube .div .span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotateY(calc(90deg * var(--i))) translateZ(50px);
  background-image: linear-gradient(
    -45deg,
    #000000,
    #13273f,
    #0d1729,
    #6a6a8d);
  background-size: 1200% 1200%;
  animation: AnimationName 30s ease infinite;
  display: flex;
  justify-content: center;
  align-items: center;
  transform-style: preserve-3d;
}

.cube .div .span p {
  position: absolute;
  font-size: 1em;
  color: white;
  transform: translateZ(20px);
}

.cube .div .span p:nth-child(1) {
  transform: translateZ(0) translateY(20px);
  color: rgba(0,0,0,0.1);
  filter: blur(2px);
}

@keyframes AnimationName {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

.top {
  position: absolute;
  top: 0;
  left: 0;
  width: 300px;
  height: 300px;
  background-image: linear-gradient(
    -45deg,
    #000000,
    #13273f,
    #0d1729,
    #6a6a8d);
  transform: rotateX(90deg) translateZ(50px);
  background-size: 1200% 1200%;
  animation: AnimationName 30s ease infinite;
}

.top::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100px;
  height: 100px;
  background-image: linear-gradient(
    -45deg,
    #000000,
    #0d0d0e,
    #030303,
    #000000);
  background-size: 1200% 1200%;
  animation: AnimationName 30s ease infinite;
  box-shadow: 0 0 120px #3d413e,0 0 120px #302f2f,0 0 120px #413f3f;
  transition: box-shadow 3s;
  transform: translateZ(-200px);
  filter: blur(40px);
}

@keyframes AnimationName2 {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}