html {
  height: 100%;
  display: grid;
}

body{margin:0;padding:0;
  }

#space {
  /* background-color: blueviolet; */
  position: absolute;
  width: 100%;
  height: 100%;
  top:0;
  left:0;
  display: grid;
  place-items: end center;
  overflow: hidden;
  --perspective: 300px;
  -webkit-perspective: var(--perspective);
          perspective: var(--perspective);
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
}
#space:after {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  content: '';
  grid-area: auto;
  width: 100%;
  height: 100%;
  /* background-image: linear-gradient(45deg, blue, transparent, yellow), linear-gradient(to right, #008aff, transparent, #e10019), linear-gradient(to bottom, green, cyan, purple); */
  /*-webkit-background-image: url(bg.jpg);*/
  mix-blend-mode: overlay;
}

#space time {
  grid-area: 1 / 1;
  width: 100px;
  height: 100px;
  -webkit-transform-origin: 50% 0%;
          transform-origin: 50% 0%;
  will-change: transform;
  background-color: white;
  box-shadow: 0 0 .5rem white, 0 0 1rem white;
}
@supports (-moz-transition: all) {
  #space time {
    box-shadow: 0 0 .5rem white;
  }
}