SOURCE

<div class="container">
  <div class="water1"></div>
  <div class="water2"></div>
  <div class="water3"></div>
  <div class="water4"></div>
</div>

@-webkit-keyframes wateranimate {
  0% {
    -webkit-transform: scale(0);
    opacity: 0.5;
  }
  100% {
    -webkit-transform: scale(2);
    opacity: 0;
  }
}
@keyframes wateranimate {
  0% {
    -webkit-transform: scale(0);
    transform: scale(0);
    opacity: 0.5;
  }
  100% {
    -webkit-transform: scale(2);
    transform: scale(2);
    opacity: 0;
  }
}
.container {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 50px auto;
  border: 1px solid yellow;
}
.water1 {
  -webkit-animation: wateranimate 12s 9s ease-out infinite;
  animation: wateranimate 12s 9s ease-out infinite;
}
.water2 {
  -webkit-animation: wateranimate 12s 6s ease-out infinite;
  animation: wateranimate 12s 6s ease-out infinite;
}
.water3 {
  -webkit-animation: wateranimate 12s 3s ease-out infinite;
  animation: wateranimate 12s 3s ease-out infinite;
}
.water4 {
  -webkit-animation: wateranimate 12s 0s ease-out infinite;
  animation: wateranimate 12s 0s ease-out infinite;
}
.water1,
.water2,
.water3,
.water4 {
  padding: 20%;
  position: absolute;
  left: 30%;
  top: 30%;
  border: 1px solid pink;
  box-shadow: 0 0 120px 30px rgba(235, 31, 137, 1) inset;
  border-radius: 100%;
  z-index: 1;
  opacity: 0;
}