Atomo con animacion CSS3

ver el codigo utilizado

<div style="background-color: #3e3b66;
  background-image: -webkit-gradient(radial, 50%, 0, 50%, 100, color-stop(0%, #3e3b66), color-stop(100%, #000000));
  background-image: -webkit-radial-gradient(center, ellipse cover, #3e3b66 0%, #000000 100%);
  background-image: -moz-radial-gradient(center, ellipse cover, #3e3b66 0%, #000000 100%);
  background-image: -o-radial-gradient(center, ellipse cover, #3e3b66 0%, #000000 100%);
  background-image: radial-gradient(center, ellipse cover, #3e3b66 0%, #000000 100%);position: relative;height: 500px;width: 100%;">

<atom><div class="center"></div><div class="atomo1"><div></div></div><div class="atomo2"><div></div></div><div class="atomo3"><div></div></div></atom></div>

<style>
[class*="atomo"], .center {
  bottom: 0;
  left: 0;
  margin: auto;
  position: absolute;
  right: 0;
  top: 0;
}
atom {
  cursor: pointer;
}

[class*="atomo"] {
  animation: glow 3s linear infinite;
  border-radius: 50%;
  border: 0.6em solid rgba(255, 255, 255, 0.8);
  border-top: 1.5em solid rgba(255, 255, 255, 0.8);
  border-bottom: 1.5em solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.3), inset 0 0 20px rgba(255, 255, 255, 0.3);
  height: 30em;
  transition: 1s transform ease-in-out;
  width: 30em;
}
[class*="atomo"] div {
  animation: rotate 2s linear infinite;
  border-radius: 50%;
  height: 100%;
  position: relative;
  width: 100%;
}
[class*="atomo"] div:after {
  animation: squash 2s linear infinite;
  -webkit-transform: scale(3, 1);
  -moz-transform: scale(3, 1);
  -ms-transform: scale(3, 1);
  -o-transform: scale(3, 1);
  transform: scale(3, 1);
  border-radius: 50%;
  content: '';
  left: 50%;
  height: 3em;
  margin-left: -1.5em;
  opacity: 0.8;
  position: absolute;
  top: -1.2em;
  width: 3em;
}

.atomo1 {
  transform: rotate(120deg) scale(0.333, 1);
}
.atomo1 div:after {
  background: #2ecc71;
  box-shadow: 0 0 20px #2ecc71;
}
atom:hover .atomo1 {
  border: 0.6em solid rgba(255, 255, 255, 0.8);
  transform: rotate(0deg) scale(0.33333, 0.33333) perspective(600px) rotateX(60deg);
}
atom:hover .atomo1 div:after {
  animation: none;
  top: -1.6em;
  transform: scale(1, 1);
}

.atomo2 {
  transform: rotate(240deg) scale(0.333, 1);
}
.atomo2 div:after {
  background: #3498db;
  box-shadow: 0 0 20px #3498db;
}
atom:hover .atomo2 {
  border: 0.6em solid rgba(255, 255, 255, 0.8);
  transform: rotate(0deg) scale(0.66667, 0.66667) perspective(600px) rotateX(60deg);
}
atom:hover .atomo2 div:after {
  animation: none;
  top: -1.6em;
  transform: scale(1, 1);
}

.atomo3 {
  transform: rotate(360deg) scale(0.333, 1);
}
.atomo3 div:after {
  background: #e74c3c;
  box-shadow: 0 0 20px #e74c3c;
}
atom:hover .atomo3 {
  border: 0.6em solid rgba(255, 255, 255, 0.8);
  transform: rotate(0deg) scale(1, 1) perspective(600px) rotateX(60deg);
}
atom:hover .atomo3 div:after {
  animation: none;
  top: -1.6em;
  transform: scale(1, 1);
}
.center {
  background: white;
  border-radius: 50%;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
  height: 3em;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.3), inset 0 0 20px rgba(255, 255, 255, 0.3);
  transition: 1s transform ease-in-out;
  width: 3em;
}
atom:hover .center {
  transform: translate(0, 0.5em);
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 0 rgba(255, 255, 255, 0.2), 0 0 10px rgba(255, 255, 255, 0.2), inset 0 0 20px rgba(255, 255, 255, 0.3);
  }

  50% {
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2), 0 0 30px rgba(255, 255, 255, 0.2), inset 0 0 20px rgba(255, 255, 255, 0.3);
  }
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes squash {
  0%,50%, 100% {
    transform: scale(1, 1);
    top: -2.6em;
  }

  25%, 75% {
    transform: scale(2, 1);
    top: -1.2em;
  }
}
</style>