.lds-ouroboro {
  position: relative;
  display: inline-block;
  height: 64px;
  width: 64px;
  margin: 0.5em;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1) inset, 0 0 25px rgba(0, 0, 255, 0.075);
}

.lds-ouroboro:after {
  content: '';
  position: relative;
  top: 15%;
  left: 15%;
  display: block;
  height: 70%;
  width: 70%;
  background: none repeat scroll 0 0 #f2f2f2;
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.lds-ouroboro > span {
  position: absolute;
  height: 100%;
  width: 50%;
  overflow: hidden;
}
.lds-ouroboro > .left {
  left: 0;
}
.lds-ouroboro > .right {
  left: 50%;
}

.lds-ouroboro > .left > .anim,
.lds-ouroboro > .right > .anim {
  position: absolute;
  left: 100%;
  top: 0;
  height: 100%;
  width: 100%;
  border-radius: 999px;
  background: none repeat scroll 0 0 #508ec3;
  animation: lds-ouroboro-rotate 3s infinite;
  opacity: 0.8;
  transform-origin: 0 50% 0;
}
.lds-ouroboro > .left > .anim {
  border-bottom-left-radius: 0;
  border-top-left-radius: 0;
}
.lds-ouroboro > .right > .anim {
  border-bottom-right-radius: 0;
  border-top-right-radius: 0;
  left: -100%;
  transform-origin: 100% 50% 0;
}

@keyframes lds-ouroboro-rotate {
  0% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(180deg);
  }
  75% {
    transform: rotate(180deg);
  }
  100% {
    transform: rotate(360deg);
  }
}