@keyframes

html


<div id='rot'></div>

<a href='#rot'>Start</a>
<p>
  <a href='#'>Stop</a>


css

#rot {
  width: 300px;
  height: 300px;
  border: 10px dashed red;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

#rot:target {
  animation: rot 5s linear infinite;
}

a {
  text-decoration: none;
  font-weight: 900;
  font-size: 25px;
  background-color: red;
  color: white;
  padding: 5px 10px;
  border-radius: 5px;
}

@keyframes rot {
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}