.cube {
  position: relative;
  width: 100%;
  min-height: 100vh;
}
.cube span {
  position: absolute;
  display: inline-block;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  border-radius: 3px;
  padding: 10px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

#top {
  background: #ffbf00;
  -webkit-transform-origin: 50% 100%;
  transform-origin: 50% 100%;
}
#top span {
  background: #e6ac00;
  color: #664d00;
}

#content {
  background: white;
  -webkit-transform-origin: 50% 0%;
  transform-origin: 50% 0%;
}
#content span {
  background: #f2f2f2;
  color: gray;
}