How to Make Ghost Animation Only CSS

<div id="container">
  <div class="ghost">
    <div class="body">
      <div class="face">
        <div class="eyes"></div>
        <div class="mouth"></div>
      </div>
      <div class="bottom">
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="wave"></div>
      </div>
    </div>
    <div class="shadow"></div>
  </div>
</div>```



$white: #fff;
$gray: #dbdbdb;
$darkgray: #c3c7cb;
$eyes: #195157;
$shadow: #174142;
$bg: #2b998c;

@mixin pseudo ($content: "") {
  position: absolute;
  content: $content;
}
* {
  box-sizing: border-box;
  ::before, ::after {
    box-sizing: border-box;
  }
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  min-height: 100vh;
  background: $bg;
}

#container {
  width: 10rem;
  height: 18rem;
}

.ghost {
  position: relative;
  .body {
    width: 10rem;
    height: 18rem;
    background: $white;
    border-radius: 5rem 5rem 1rem 1rem;
    box-shadow: inset -1.25rem;
    animation: ghostFloat 2s ease-in-out infinite;
    .face {
      position: absolute;
      top: 4.2rem;
      left: 2.8rem;
      .eyes {
        width: 1.9rem;
        height: 2.6rem;
        background: $eyes;
        border-radius: 50%;
        animation: eyesBlink 3s linear infinite;
         &::before {
          @include pseudo;
          width: 85%;
          height: inherit;
          left: 4.3rem;
          background: inherit;
          border-radius: inherit;
        }
      }
      .mouth {
        position: absolute;
        top: 2.5rem;
        left: .2rem;
        background: $white;
        width: 6rem;
        height: 2rem;
        border-radius: 50%;

        &::after {
          @include pseudo;
          z-index: -1;
          width: 83%;
          left: .3rem;
          height: inherit;
          border-radius: 50%;
          box-shadow: 0px 5px 0px 0px $eyes;
        }
      }
    }
  }
  .bottom {
    position: absolute;
    top: 17rem;
    .circle {
      position: absolute;
      z-index: 2;
      width: 2.23rem;
      height: 2.2rem;
      background: $white;
      border-radius: 0 0 1rem 1rem;
      &:nth-child(1) {
        left: 0;
      }
      &:nth-child(2) {
        left: 3.9rem;
        border-radius: 1rem;
      }
      &:nth-child(3) {
        left: 7.8rem;
      }
    }
    .wave {
      position: relative;
      z-index: 1;
      left: 2rem;
      width: 2.2rem;
      height: 2.2rem;
      background: $darkgray;
      border-radius: 1rem;
      box-shadow: inset 0rem 1.1rem 0 $white;
      &::before {
        @include pseudo;
        left: 3.9rem;
        width: inherit;
        height: inherit;
        background: inherit;
        border-radius: inherit;
        box-shadow: inherit;
      }
    }
  }
}

.shadow {
  position: absolute;
  width: 10rem;
  height: 1rem;
  top: 20rem;
  border-radius: 50%;
  background: $shadow;
  filter: blur(0.1rem);
  animation: shadowAnimation 2s linear infinite;
}

@keyframes ghostFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-1rem);
  }
}
@keyframes eyesBlink {
  0%, 30%, 38%, 100% {
    transform: scale(1);
  }
  34%, 36% {
    transform: scale(1,0);
  }
}

@keyframes shadowAnimation {
  0%, 100% {
    opacity: 100%;
    transform: scale(1);
  }
  50% {
    opacity: 70%;
    transform: scale(0.9, 0.9);
  }
}