*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
}

body {
  overflow: hidden;
}

#viewport {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #1a55ac;
  perspective: 400px;
  overflow: hidden;
}

#world {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 51.2rem;
  height: 51.2rem;
  background-color: rgba(255,0,0,0.2);
  transform-style: preserve-3d;
  margin: -25.6rem 0 0 -25.6rem;
}

.cloud-base {
  position: absolute;
  top: 25.6rem;
  left: 25.6rem;
  width: 2rem;
  height: 2rem;
  background: rgba(255,0,0,0.5);
  transform-style: preserve-3d;
  margin: -1rem 0 0 -1rem;
}

.cloud-layer {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 25.6rem;
  height: 25.6rem;
  background: rgba(33,160,223,0.5);
  margin: -12.8rem 0 0 -12.8rem;
  transform-style: preserve-3d;
}