<div class="wrap">
  <div class="blobwrap">
    <div class="blob blob1"></div>
    <div class="middle"></div>
    <div class="blob blob2"></div>
  </div>
</div>

.wrap {
  background: linear-gradient(to right, white 0%, black 100%);
  width: 650px;
  height: 350px;
  margin: auto;
}
.blobwrap {
  width: 100%;
  height: 100%;
  border: 5px solid cyan;
  display: flex;
  margin: 1rem auto;
  position: relative;
  background: black;
  justify-content: center;
  align-items: center;
  mix-blend-mode: hard-light;
}
.blob {
  width: 240px;
  height: 240px;
  border-radius: 100%;
  background: lightslategray;
}
.blob2 {
}

.blob {
  filter: blur(7px);
}
.blobwrap {
  filter: contrast(7);
}

.blob1 {
  animation: gooey1 3s linear infinite;
}

@keyframes gooey1 {
  0% {
    transform: translateX(90%);
  }
  50% {
    transform: translateX(20%);
  }
  100% {
    transform: translateX(90%);
  }
}

.blob2 {
  animation: gooey2 3s linear infinite;
}

@keyframes gooey2 {
  0% {
    transform: translateX(-90%);
  }
  50% {
    transform: translateX(-20%);
  }
  100% {
    transform: translateX(-90%);
  }
}

.middle {
  width: 180px;
  height: 150px;
  background: lightslategray;
  clip-path: path(
    "M 0 0 C 90 50 90 50 180 0 L 180 150 C 90 100 90 100 0 150 Z"
  );
}