【CSS】How to crop an image into a circle and keep it moving like a searchlight | Demo page

.block {
  width: 540px;
  margin: 70px auto 0;
}
.img {
  position: relative;
  overflow: hidden;
  border-radius: 50%;
  transform-origin: 50.5% 49.5%;
  animation: circle01 6s linear infinite;
  backface-visibility: hidden;
}
.img img {
  transform-origin: 50.6% 49.4%;
  animation: circle02 6s linear infinite;
  backface-visibility: hidden;
}

@keyframes circle01 {
  100% {
  transform: rotate(360deg);
  }
}

@keyframes circle02 {
  0% {
  transform: rotate(360deg) scale(1.03);
  }
  100% {
  transform: rotate(0deg) scale(1.03);
  }
}
@media screen and (max-width:640px){
  .block {
    width: 100%;
  }
}