.nine .shape.a {
  animation: nine 4s infinite cubic-bezier(.93,0,.67,1.21);
  left: calc(50% - 12em);
  transform-origin: 100% 4em;
}
.nine .shape.b {
  animation: nine 2s infinite cubic-bezier(1,-0.97,.23,1.84);
  left: calc(50% + 2em);
  transform-origin: 100% 100%;
}

@keyframes nine {
  0%, 10% {
    transform: translateX(0);
  }
  40%, 60% {
    transform: rotateZ(90deg);
  }
  90%, 100% {
    transform: translateX(0);
  }
}