Code Playground

@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans:300,400,600,700,800);
*,
:after,
:before {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
@property --hue {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}
div {
  transform-style: preserve-3d;
  box-sizing: border-box;
}
.cont {
  --clr: hsl(var(--hue) 80% 80%);
  --hue2: calc(var(--hue) + 90deg);
  --clr2: hsl(var(--hue2) 80% 80%);
  color: var(--clr);
  filter: drop-shadow(0 0 1.5vmin currentcolor);
  animation: clr-chg infinite 10s linear;
}
.cube {
  
  width: 40vmin;
  aspect-ratio: 1;
  position: relative;
  rotate: 1 1 1 45deg;
  animation: 
    rot infinite 20s linear;
  &:hover {
    animation-play-state: paused;
    .side {
      --clr2: color-mix(in lab, var(--clr), #fff);
      box-shadow: 0 0 2vmin currentcolor;
    }
  }
}
.side {
  --ang: 45deg;
  position: absolute;
  inset: 0;
  font-size: 3rem;
  //border: 1px solid;
  background-image: 
    repeating-linear-gradient(
      var(--ang),
      #0000 0 9%,
      var(--clr) 0 14%,
      #0000 0 23%,
      var(--clr2) 0 27%,
      #0000 0
    );
}

.side:nth-of-type(1){
  translate: 0 0 20vmin;
  
}
.side:nth-of-type(2){
  rotate: y 90deg;
  translate: 20vmin;
  transform: rotatez(270deg);
}
.side:nth-of-type(3){
  rotate: y 90deg;
  translate: -20vmin;
  //--ang: 135deg;
  transform: rotatez(90deg);
}
.side:nth-of-type(4){
  rotate: x 90deg;
  translate: 0 20vmin;
  transform: rotatez(270deg);
}
.side:nth-of-type(5){
  rotate: x 90deg;
  translate: 0 -20vmin;
  --ang: 135deg;
}
.side:nth-of-type(6){
  translate: 0 0 -20vmin;
  transform: rotatez(180deg);
}

@keyframes rot {
  to {
    transform: rotatex(1080deg) rotatey(360deg) rotatez(720deg)
  }
}

@keyframes clr-chg {
  from {
    --hue: 0deg;
  }
  to {
    --hue: 360deg;
  }
}

body {
  display: grid;
  place-content: center;
  min-height: 100vh;
  margin: 0;
  background: 
    radial-gradient(
      at 100% 20%,
      #5EB0E525, 
      #0000 70%
    ), 
    radial-gradient(
      at 20% 20%,
      #F3D06025, 
      #0000 70%
    ),
    radial-gradient(
      at 20% 100%,
      #A5282C25, 
      #0000 70%
    ),
    radial-gradient(
      at 100% 100%,
      #AEE1CD25, 
      #0000 70%
    ),
    #1f2020;
  background-blend-mode: color-dodge;
}

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