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;
  display: visible;
}

.cube {
  width: 40vmin;
  aspect-ratio: 1;
  position: relative;
  rotate: 1 1 1 45deg;
  animation: rot infinite 20s linear;
}
.cube:hover {
  animation-play-state: paused;
}
.cube:hover .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;
  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;
  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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