SOURCE

console 命令行工具 X clear

                    
>
console
<div class="start">
    <div></div>
</div>
.start {
  width: 80vmin;
  height: 80vmin;
  margin: 10vmin;
}
div {
  position: absolute;
  left: 0;
  top: 0;
  width: 50%;
  height: 50%;
  background-color: rgba(255,255,203,.2);
  border-radius: 50%;
  animation: spin 10s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}