如何使用css实现毛毛虫爬行动作？

<div class='container'>
 <div class='hide left'></div>
 <div class='hide right'></div>
 <div class='hide bottom'></div>
 <div class='circle-container'>
  <div class='circle'></div>
 </div>
</div>

 <style>
body {
 background-color: #1B6CB2;
 margin: 0;
}
.container {
 position: absolute;
 width: 600px;
 height: 400px;
 overflow: hidden;
 top: 50%;
 left: 60%;
 transform: translate(-50%, -50%);
}
.hide {
 height: 100%;
 width: 150px;
 background: #1B6CB2;
 position: absolute;
 z-index: 2;
}
.hide.left {
 left: 0;
}
.hide.right {
 right: 0;
}
.hide.bottom {
 bottom: 0;
 width: 100%;
 height: 50%;
}
.circle {
 position: absolute;
 height: 75px;
 width: 150px;
 border: 3px solid white;
 border-radius: 50%/100% 100% 0 0;
 border-bottom: none;
 top: 40%;
 left: 50%;
 transform-origin: 0% 50%;
 transform: translate(-50%, -50%);
 animation: magic 1.8s ease infinite;
}
@keyframes magic {
 0% {
  transform: rotate(-170deg) translate(-50%, -50%);
 }
 50% {
  transform: rotate(0deg) translate(-50%, -50%);
 }
 100% {
  transform: rotate(180deg) translate(-50%, -50%);
 }
}
.circle-container {
 position: absolute;
 height: 75px;
 width: 150px;
 top: 40%;
 left: 50%;
 transform-origin: 0% 50%;
 transform: translate(-50%, -50%);
 animation: power 1.8s ease-out infinite;
}
@keyframes power {
 0% {
  margin-left: 20px;
 }
 50% {
  margin-left: -55px;
 }
 99.9% {
  margin-left: -130px;
 }
 100% {
  margin-left: 20px;
 }
}
 </style>