SOURCE

<div class="circle"></div>

.circle {
  width: 100px;
  height: 100px;
  border-radius: 100%;
  background: #ccc;
  border: 2px solid #fff;
  position: relative;
  animation: orb 2s linear infinite
}

.circle:after {
  content: "";
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 100%;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  margin: auto;
  transform: translateY(-50%);
  background: red;
}

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