Edit in JSFiddle

<div class="waves">
</div>
html,
body {
  width: 100%;
  height: 100%;
}
body {
  background: #0A212E;
  margin: 0px;
  overflow: hidden;
  animation: color-loop 18s infinite;
}
.waves {
  position: relative;
  top: 50%;
  background: rgba(255, 255, 255, 0.3);
  left: 50%;
  width: 25px;
  height: 25px;
  margin-left: -12px;
  margin-top: -12px;
  border-radius: 50%;
  -webkit-backface-visibility: hidden;
}
.waves:before {
  position: absolute;
  background: white;
  margin-left: -12px;
  margin-top: -12px;
  width: 50px;
  height: 50px;
  content: "";
  display: block;
  border-radius: 50%;
  -webkit-backface-visibility: hidden;
  animation: wave-animate 3s infinite ease-out;
}
.waves:after {
  position: absolute;
  background: white;
  margin-left: -12px;
  margin-top: -12px;
  width: 50px;
  height: 50px;
  content: "";
  display: block;
  border-radius: 50%;
  -webkit-backface-visibility: hidden;
  opacity: 0;
  animation: wave-animate 3s 1.5s infinite ease-out;
}
@keyframes wave-animate {
  0% {
    transform: scale(0);
    opacity: 1;
    transform-origin: center;
  }
  100% {
    transform: scale(3);
    opacity: 0;
    transform-origin: center;
  }
}
@keyframes color-loop {
  0% {
    background: #2CAB5B;
  }
  25% {
    background: #FABC03;
  }
  50% {
    background: #ED4B40;
  }
  75% {
    background: #4286F3;
  }
  100% {
    background: #2CAB5B;
  }
}