.content
  - for (var b=0; b<16; b++)
    .cuboid
      - for (var s=0; s<6; s++)
        .side

@property --color{
  syntax: '<percentage>';
  inherits: false;
  initial-value: 10%;
}

@property --tone{
  syntax: '<number>';
  inherits: false;
  initial-value: 0;
}

:root {
  --bg: #111;
  --size: 8;
  --speed: 2;
  --hue: 0;
  --tone: 0;
}

* {
  transform-style: preserve-3d;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 250vmin;
  background: var(--bg);
}

/*
body:after {
  content: "";
  position: absolute;
  background: 
    linear-gradient(37.5deg, var(--bg) 28%, #fff0 35%), 
    linear-gradient(-37.5deg, var(--bg) 28%, #fff0 35%);
  width: 100%;
  height: 100%;
  opacity: 0.75;
}
*/

.content {
  width: calc(var(--size) * 6vmin);
  height: calc(var(--size) * 6vmin);
  transform: rotateX(45deg) rotateZ(45deg);
}

.cuboid {
  --height: var(--size);
  --width: var(--size);
  --depth: calc(var(--size) * 5);
  --delay: calc(calc(var(--speed) / 16) * 1s);
  --sat: var(--color, 50%);
  --hue: var(--tone, 0);
  --win: calc(calc(var(--size) / 6) * 1vmin);
  height: calc(var(--height) * 1vmin);
  width: calc(var(--width) * 1vmin);
  position: absolute;
  transform: translate3d(0vmin, 0vmin, 0vmin);
  animation: grow calc(var(--speed) * 1s) ease 0s infinite, colors calc(var(--speed) * 2.25s) linear 0s infinite;
  transition: --color calc(var(--speed) * 1s) 0s, --tone calc(var(--speed) * 2,25s) 0s;
}

.cuboid .side {
  position: absolute;
  top: 50%;
  left: 50%;
  height: 100%;
  width: 100%;
  border-radius: 2px;
}

.cuboid .side:nth-of-type(1) {
  transform: translate3d(-50%, -50%, calc(var(--depth) * 0.5vmin));
  background: linear-gradient(-125deg, #fff8, #fff0), hsl(var(--hue), var(--sat), 55%);
  border: calc(calc(var(--size) / 12) * 1vmin) solid #fff0;
  border-color: #6e6e6e #958d9b #999999 #b3b3b3;
}

.cuboid .side:nth-of-type(2) {
  transform: translate3d(-50%, -50%, calc(var(--depth) * -0.5vmin)) rotateY(180deg);
  background: hsl(var(--hue), var(--sat), 25%);
  display: none;
}

.cuboid .side:nth-of-type(3) {
  width: calc(var(--depth) * 1vmin);
  transform: translate(-50%, -50%) rotateY(90deg) translate3d(0, 0, calc(var(--width) * 0.5vmin));
  background: 
    linear-gradient(135deg, #fff6, #fff0 50%), 
    linear-gradient(90deg, #fff0, var(--bg) 100%), 
    repeating-conic-gradient(from 0deg at var(--win) calc(var(--win) * 1.5), #808e93, #bbbab0 25%, #fff0 0 100%),
    hsl(var(--hue), var(--sat), 40%);
  background-repeat: no-repeat, no-repeat, repeat, no-repeat;
  background-size: 100% 100%, 100% 100%, calc(calc(var(--size) / 2) * 1.35vmin) calc(calc(var(--size) / 3.2) * 1vmin), 100% 100%;
  background-position: 0 0, 0 0, 0 calc(calc(var(--size) / 15) * 1vmin), 0 0;
}

.cuboid .side:nth-of-type(4) {
  width: calc(var(--depth) * 1vmin);
  transform: translate(-50%, -50%) rotateY(-90deg) translate3d(0, 0, calc(var(--width) * 0.5vmin));
  background: linear-gradient(-90deg, hsl(var(--hue), var(--sat), 40%) 20%, var(--bg) 100%);
}

.cuboid .side:nth-of-type(5) {
  height: calc(var(--depth) * 1vmin);
  transform: translate(-50%, -50%) rotateX(90deg) translate3d(0, 0, calc(var(--height) * 0.5vmin));
  background: linear-gradient(45deg, hsl(var(--hue), var(--sat), 20%) 20%, var(--bg) 100%);
}

.cuboid .side:nth-of-type(6) {
  height: calc(var(--depth) * 1vmin);
  transform: translate(-50%, -50%) rotateX(-90deg) translate3d(0, 0, calc(var(--height) * 0.5vmin));
  background: 
    linear-gradient(180deg, #fff0, var(--bg) 100%), 
    repeating-conic-gradient(from 0deg at calc(var(--win) * 0.5) calc(var(--win) * 2.75), #43484a, #706f68 25%, #fff0 0 100%),
    hsl(var(--hue), var(--sat), 20%);
  background-repeat: no-repeat, repeat, no-repeat;
  background-size: 100% 100%, calc(calc(var(--size) / 3.2) * 1vmin) calc(calc(var(--size) / 2) * 1.35vmin), 100% 100%;
  background-position: 0 0, calc(calc(var(--size) / 1.065 ) * 1vmin) calc(calc(var(--size) / 7) * 1vmin), 0 0;
}




.cuboid .side:nth-of-type(1):before {
  content: " ";
  position: absolute;
  width: 80%;
  height: 80%;
  left: 10%;
  top: 10%;
  box-sizing: border-box;
  background: 
    linear-gradient(45deg, #95899e 0 5%, #fff0 0 95%, #c3bcc8 0 100%), 
    conic-gradient( from -90deg at 90% 90%, #7d8b91, #c1beb3 25%, #948c99 0 62.5%, #545157 0 100%);
}



.cuboid:nth-child(2) {
  left: calc(calc(var(--size) / 4 ) * 5vmin);
  animation-delay: calc(var(--delay) * -15);
} 

.cuboid:nth-child(3) {
  left: calc(calc(var(--size) / 4 ) * 10vmin);
  animation-delay: calc(var(--delay) * -14);
} 

.cuboid:nth-child(4) {
  left: calc(calc(var(--size) / 4 ) * 15vmin);
  animation-delay: calc(var(--delay) * -13);
} 

.cuboid:nth-child(5) {
  left: calc(calc(var(--size) / 4 ) * 20vmin);
  animation-delay: calc(var(--delay) * -12);
}

.cuboid:nth-child(6) {
  left: calc(calc(var(--size) / 4 ) * 20vmin);
  top: calc(calc(var(--size) / 4 ) * 5vmin);
  animation-delay: calc(var(--delay) * -11);
} 

.cuboid:nth-child(7) {
  left: calc(calc(var(--size) / 4 ) * 20vmin);
  top: calc(calc(var(--size) / 4 ) * 10vmin);
  animation-delay: calc(var(--delay) * -10);
} 

.cuboid:nth-child(8) {
  left: calc(calc(var(--size) / 4 ) * 20vmin);
  top: calc(calc(var(--size) / 4 ) * 15vmin);
  animation-delay: calc(var(--delay) * -9);
} 

.cuboid:nth-child(9) {
  left: calc(calc(var(--size) / 4 ) * 20vmin);
  top: calc(calc(var(--size) / 4 ) * 20vmin);
  animation-delay: calc(var(--delay) * -8);
} 

.cuboid:nth-child(10) {
  top: calc(calc(var(--size) / 4 ) * 20vmin);
  left: calc(calc(var(--size) / 4 ) * 15vmin);
  animation-delay: calc(var(--delay) * -7);
} 

.cuboid:nth-child(11) {
  top: calc(calc(var(--size) / 4 ) * 20vmin);
  left: calc(calc(var(--size) / 4 ) * 10vmin);
  animation-delay: calc(var(--delay) * -6);
} 

.cuboid:nth-child(12) {
  top: calc(calc(var(--size) / 4 ) * 20vmin);
  left: calc(calc(var(--size) / 4 ) * 5vmin);
  animation-delay: calc(var(--delay) * -5);
} 

.cuboid:nth-child(13) {
  top: calc(calc(var(--size) / 4 ) * 20vmin);
  left: 0;
  animation-delay: calc(var(--delay) * -4);
} 

.cuboid:nth-child(14) {
  top: calc(calc(var(--size) / 4 ) * 15vmin);
  animation-delay: calc(var(--delay) * -3);
} 

.cuboid:nth-child(15) {
  top: calc(calc(var(--size) / 4 ) * 10vmin);
  animation-delay: calc(var(--delay) * -2);
} 

.cuboid:nth-child(16) {
  top: calc(calc(var(--size) / 4 ) * 5vmin);
  animation-delay: calc(var(--delay) * -1);
}


@keyframes grow {
     0% { --color: 60%; transform: translateZ(calc(var(--size) * 1vmin)); }
    90% { --color: 10%; transform: translateZ(calc(var(--size) * -2vmin)); }
   100% { --color: 60%; transform: translateZ(calc(var(--size) * 1vmin)); }
}

@keyframes colors {
     0% { --tone: 360; }
   100% { --tone: 0; }
}