body {
  background-color: rgba(0, 0, 0, 0.87);
}
.ring {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -120px 0 0 -120px;
  width: 240px;
  height: 240px;
}

.ring-light {
  width: 240px;
  height: 240px;
  border-radius: 240px;
  box-shadow: 0 4px 0 #00abf2 inset;
  animation: rotate 2s linear infinite;
}

.ring-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 240px;
  height: 240px;
  border-radius: 240px;
  box-shadow: 0 0 10px 4px rgba(0, 0, 0, 0.3) inset;
}

@keyframes rotate {
  from {
    transform: rotate(0);
  }                                              
  to {
    transform: rotate(360deg);
  }
}