.rotate-c
  .rotate-o

@function multiple-shadow ($n) {
  $value: 0 4px 0 4px #eee;
  $color: #eee;
  @for $i from 2 through $n {
     @if $i % 2 == 0 {
       $color: #eee;
     } @else {
       $color: #292929;
     }
    $value: '#{$value} , 0 #{$i * 4}px 0 #{$i * 8}px ' + $color;
  }

  @return unquote($value);
}

body {
  background: black url('http://fay.io/e/vosBF/stars.jpg') repeat;
}

.rotate-c {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  width: 500px;
  height: 500px;
  margin: auto;
  border-radius: 999px;
  background-color: #eee;
  -webkit-backface-visibility: hidden;
  -webkit-perspective: 1000;
  animation: spin-bob 2.5s linear infinite;
  box-shadow: 0 0 100px 0 rgba(255,255,255,.4);
}

.rotate-o {
  position: absolute;
  top: 125px;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 1em;
  background-color: #eee;
  margin-left: -5px;
  box-shadow: multiple-shadow(30);
}

@keyframes spin-bob {
  0% {
    transform: rotate(0deg) scale(.95) translate3d(0, 10px, 0);
  }
  50% {
    transform: rotate(180deg) scale(1.05) translate3d(0, -10px, 0);
  }
  100% {
    transform: rotate(360deg) scale(.95) translate3d(0, 10px, 0);
  }
}

// Inspired by The Twilight Zone's
// http://fay.io/e/vosBF/spiral-of-madness.gif