data/val/codepen-nVKpWP-mRyVRQ/full.html

<!DOCTYPE html>
<html>
<head>
  <style>div.container {
  width: 100px;
  margin: 0 auto;
  padding-top:100px;
}

div.circle {
  animation-duration: 1s;
  animation-name: pulseSize;
  animation-direction:alternate;
  animation-iteration-count: infinite;
  animation-timing-funtion:ease-in;
  
  border-radius:50%;
  height: 50px;
  width: 50px;
  background-color:rgba(0,0,255,0.50);
  mix-blend-mode: multiply;
}


@keyframes pulseSize {
  0% { 
  }
  100% {
    margin-top:-50px;
    margin-left:50px;
  }
}

div._2 {
  animation-delay:0.2s;
  background-color:rgba(255,0,0,0.5);
}
div._3 {
  animation-delay:0.4s;
    background-color:rgba(0,255,0,0.5);
}


</style>
</head>
<body>
  <div class="container">
  <div class="circle"></div>
  <div class="circle _2"></div>
  <div class="circle _3"></div>
</div>
  <script></script>
</body>
</html>