:root {
  --boxColor: #0ff7;
  --ballColor: #f0f;
  --rotateSpeed: 30s;
  --bounceSpeed: 1.4s;
}

body,
html {
  margin: 0;
  padding: 0;
  background-color: #111;
  min-height: 100vh;
  display: -webkit-flex;
  display: -ms-flex;
  display: flex;
  justify-content: center;
  -ms-align-items: center;
  align-items: center;
}
body {
  overflow: hidden;
}

.header {
  position: absolute;
  top: 1rem;
}

.container {
  font-size: 60px;
  perspective: 10em;
  max-height: 50%;
  perspective-origin: 50% calc(50% - 2em);
}

.scene {
  position: relative;
  transform-style: preserve-3d;
  animation: sceneRotate var(--rotateSpeed) infinite linear;
}

@keyframes sceneRotate {
  to {
    transform: rotateY(360deg);
  }
}

.ball {
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: absolute;
  left: -0.5em;
  bottom: 1em;
  background-image: radial-gradient(circle at top, var(--ballColor), #000);
  animation: sceneRotate var(--rotateSpeed) infinite linear reverse,
    ballBounce var(--bounceSpeed) infinite ease-out,
    ballHeight var(--bounceSpeed) infinite;
}

@keyframes ballBounce {
  0%,
  100% {
    bottom: 0.5em;
    /* transform: translateY(.5em); */
  }

  50% {
    bottom: 5em;
    /* transform: translateY(-5em); */
    animation-timing-function: ease-in;
  }
}

@keyframes ballHeight {
  3%,
  100% {
    height: 0.8em;
  }

  13%,
  100% {
    height: 1em;
  }
}

.ballShadow {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(#000, #0000 50%);
  animation: ballShadow var(--bounceSpeed) infinite ease-out;
}

@keyframes ballShadow {
  0%,
  6.5%,
  80%,
  100% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(2);
    opacity: 0.5;
    animation-timing-function: ease-in;
  }
}

.cube {
  width: 2em;
  height: 2em;
  position: absolute;
  bottom: -1em;
  left: -1em;
  transform-style: preserve-3d;
  animation: cubeHeight var(--bounceSpeed) infinite linear;
}

@keyframes cubeHeight {
  0%,
  100% {
    height: 1.5em;
  }

  6.5%,
  80% {
    height: 2em;
  }
}

.side {
  position: absolute;
  width: 100%;
  height: 100%;
  background: var(--boxColor);
  -webkit-box-shadow: inset 0 0 0.5em #000;
  box-shadow: inset 0 0 0.5em #000;
  /* border-style: solid;
  border-color: #f00; */
}

.front {
  transform: translateZ(1em);
}

.right {
  transform: rotateY(90deg) translateZ(1em);
}

.back {
  transform: rotateY(180deg) translateZ(1em);
}

.left {
  transform: rotateY(270deg) translateZ(1em);
}

.top {
  transform: translateY(-50%) rotateX(90deg);
  height: 2em;
}

.bottom {
  bottom: 0px;
  height: 2em;
  transform: translateY(50%) rotateX(270deg);
  background: #0007;
  -webkit-box-shadow: 0 0 0.5em #000;
  box-shadow: 0 0 0.5em #000;
}

.floor {
  width: 15em;
  height: 15em;
  background-image: radial-gradient(#0000, #000),
    repeating-conic-gradient(from 45deg, #111 0deg 90deg, #222 90deg 180deg);
  -webkit-background-size: 100%, 1em 1em;
  background-size: 100%, 1em 1em;
  position: absolute;
  -webkit-transform: translate(-50%, -50%) rotateX(90deg);
  -ms-transform: translate(-50%, -50%) rotateX(90deg);
  transform: translate(-50%, -50%) rotateX(90deg);
  top: 1em;
}