:root {
  --cube-size: 20vmin;
}

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #303030;
  font-family: Arial, sans-serif;
}

.scene {
  width: var(--cube-size);
  height: var(--cube-size);
  perspective: 600px;
}

.cube {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 2s ease-in-out;
}

.face {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(154, 217, 234, 0.9);
  border: 1px solid #333;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: calc(var(--cube-size) / 5);
  font-weight: bold;
  color: #333;
}

.front  { transform: rotateY(  0deg) translateZ(calc(var(--cube-size) / 2)); }
.back   { transform: rotateY(180deg) translateZ(calc(var(--cube-size) / 2)); }
.right  { transform: rotateY( 90deg) translateZ(calc(var(--cube-size) / 2)); }
.left   { transform: rotateY(-90deg) translateZ(calc(var(--cube-size) / 2)); }
.top    { transform: rotateX( 90deg) translateZ(calc(var(--cube-size) / 2)); }
.bottom { transform: rotateX(-90deg) translateZ(calc(var(--cube-size) / 2)); }


@media (max-width: 600px) {
  :root {
    --cube-size: 40vmin;
  }
}

@media (min-width: 1200px) {
  :root {
    --cube-size: 30vmin;
  }
}