<img src="https://images.unsplash.com/photo-1501102057089-b3e50a55eff6?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1080&fit=max&s=297af13dbc73e7f4203880098353c663" alt="" />

body{
  padding: 10px;
  background-color: rgb(230,230,230);
}
img{
  border-radius: 50%;
  width: 200px;
  height: 200px;
  position: relative;
  display: block;
  margin: 0 auto;
  border: thin solid orange;
  animation-name: cos;
  animation-duration: 4s;
  animation-timing-function:linear ;
  animation-iteration-count: infinite;
}
img:hover{
  animation-play-state: paused;
}
@keyframes cos {
  0% {transform:rotate(0deg)}
  100% {transform:rotate(360deg)}
}