.meridian, .sphere {
  transform-style:preserve-3d;
}

.sphere {
  position:relative;

}

.polygon {
  position:absolute;
  margin:auto;
  background-repeat:no-repeat;
  backface-visibility:hidden;

}

@keyframes rotate {
  from { transform:rotate3d(1,1,0,0deg); }
  to { transform:rotate3d(1,1,0,360deg); }

}