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HTML

            
              
  <div class="cube">
    <div class="side  front">1</div>
    <div class="side   back">6</div>
    <div class="side  right">4</div>
    <div class="side   left">3</div>
    <div class="side    top">5</div>
    <div class="side bottom">2</div>
  </div>

            
          
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CSS

            
              
.cube {
  font-size: 5em;
  width: 2em;
  height: 2em;
  margin: 1em auto;
  transform-style: preserve-3d;
  perspective: 500px;
  animation: move-origin infinite 2s;
}

.side {
  position: absolute;
  width: 2em;
  height: 2em;
  
  background: rgba(tomato, .6);
  border: 1px solid rgba(0,0,0,.5);
  
  color: white; 
  text-align: center;
  line-height: 2em;
}

.front  { transform:                  translateZ(1em); }
.top    { transform: rotateX( 90deg)  translateZ(1em); }
.right  { transform: rotateY( 90deg)  translateZ(1em); }
.left   { transform: rotateY(-90deg)  translateZ(1em); }
.bottom { transform: rotateX(-90deg)  translateZ(1em); }
.back   { transform: rotateY(-180deg) translateZ(1em); }

@keyframes move-origin {
  0%    { perspective-origin: 0%     0%; }
  25%   { perspective-origin: 100%   0%; }
  50%   { perspective-origin: 100% 100%; }
  75%   { perspective-origin: 0%   100%; }
  100%  { perspective-origin: 0%     0%; }
}
            
          
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JS

            
              
            
          
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