.eight .shape.a {
  transform: translateX(-1em);
  animation: eight-shape-a 4s cubic-bezier(.57,-0.5,.43,1.53) infinite;
}

.eight .shape.b {
  top: calc(50% + 4em);
  opacity: 0;
  animation: eight-shape-b 4s linear infinite;
}

.eight .shape.c {
  transform: translateX(1em);
  animation: eight-shape-c 4s cubic-bezier(.57,-0.5,.43,1.53) infinite;
}

@keyframes eight-shape-a {
  0%, 50% {
    transform: translateX(-4em);
  }
  70%, 100% {
    transform: translateX(-6em);
  }
}

@keyframes eight-shape-b {
  0% {
    transform: none;
  }
  20%, 30% {
    transform: translateY(-1.5em);
    opacity: 1;
    animation-timing-function: cubic-bezier(.57,-0.5,.43,1.53);
  }
  32% {
    transform: translateY(-1.25em);
    opacity: 1;
  }
  34% {
    transform: translateY(-1.75em);
    opacity: 1;
  }
  36%, 38% {
    transform: translateY(-1.25em);
    opacity: 1;
  }
  42%, 60% {
    transform: translateY(-1.5em);
    opacity: 1;
  }
  75%, 100% {
    transform: translateY(-6em);
    opacity: 1;
  }
}

@keyframes eight-shape-c {
  0%, 50% {
    transform: translateX(4em);
  }
  70%, 100% {
    transform: translateX(6em);
  }
}