<div class="blobwrap">
  <div class="blob blob1"></div>
  <div class="blob blob2"></div>
</div>
.blobwrap {
  width: 650px;
  height: 350px;
  border: 5px solid cyan;
  display: flex;
  margin: 1rem auto;
  position: relative;
  background: black;
  justify-content: space-around;
  align-items: center;
}
.blob {
  width: 200px;
  height: 200px;
  border-radius: 100%;
  background-color: lime;
  background-image: linear-gradient(
    to right,
    rgba(255, 255, 250, 0.45) -80%,
    rgba(200, 200, 200, 1) 100%
  );
  background-blend-mode: hue;
}
.blob2 {
  background-image: linear-gradient(
    to left,
    rgba(255, 255, 250, 0.45) -80%,
    rgba(200, 200, 200, 1) 100%
  );
}

.blob {
  filter: blur(20px);
}
.blobwrap {
  filter: contrast(20);
}

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

@keyframes gooey1 {
  50% {
    transform: translateX(50%);
  }
}

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

@keyframes gooey2 {
  50% {
    transform: translateX(-50%);
  }
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.