Echo / Waves animation

by AdonaiAraya

HTML

<div class="waves">
  <span class="wave"></span>
  <span class="wave"></span>
  <span class="wave"></span>
</div>

CSS

@-webkit-keyframes echo {
  0% {
    padding: 0;
    margin: 0;
    opacity: 1;
  }

  100% {
    padding: 50px;
    margin: -50px;
    opacity: 0;
  }
}

@keyframes echo {
  0% {
    padding: 0;
    margin: 0;
    opacity: 1;
  }

  100% {
    padding: 50px;
    margin: -50px;
    opacity: 0;
  }
}

.waves {
  position: absolute;
  left: 50%;
  top: 50%;
}

.wave {
  position: absolute;
  border: 2px solid #363636;
  border-radius: 50%;
  display: inline-block;
  padding: 0;

  animation-name: echo;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-out;

  -webkit-animation-name: echo;
  -webkit-animation-duration: 2s;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-timing-function: ease-out;
}

.wave:nth-of-type(2) {
  animation-delay: 0.4s;
  -webkit-animation-delay: 0.4s;
}

.wave:nth-of-type(3) {
  animation-delay: 0.8s;
  -webkit-animation-delay: 0.8s;
}