<div class="loading"></div>

.loading {
  animation: clockwise 1.5s linear infinite;
  display: block;
  height: 2em;
  margin: auto;
  position: relative;
  width: 2em;
}

.loading,
.loading:before,
.loading:after {
  border: .2em solid transparent;
  border-radius: 50%;
  border-top-color: rgba(25,255,255,0.6);
  margin: auto;
}

.loading:before,
.loading:after {
  content: '';
  position: absolute;
}

.loading:before {
  animation: anticlockwise .9s linear infinite;
  top: -.6em;
  right: -.6em;
  bottom: -.6em;
  left: -.6em;
}

.loading:after {
  animation: anticlockwise .66s linear infinite;
  top: .3em;
  right: .3em;
  bottom: .3em;
  left: .3em;
}

@keyframes clockwise {
  0%  { transform: rotate(0deg) }
  100%{ transform: rotate(360deg) }
}

@keyframes anticlockwise {
  0%  { transform: rotate(360deg) }
  100%{ transform: rotate(0deg) }
}

body {
  background-color: #222;
  display: flex;
  min-height: 95vh;
}