@keyframes outer {
  0% {
    transform: rotate(160deg);
    opacity: 0;
  }
  50% {
    transform: rotate(120deg);
    opacity: 1;
  }
  100% {
    transform: rotate(-320deg);
    opacity: 0;
  }
}
@keyframes inner {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}