<a href="">
  <img src=" http://i.imgur.com/Be4Vpun.png" alt="">
</a>

a {
  border:1px solid red;
  margin: 25px;
  display: inline-block;
}

img {
  -webkit-animation: fade 20s alternate infinite;
  animation: fade 13s alternate infinite;
  display: block;
}

@-webkit-keyframes fade {
  0% {
    opacity: 0.6;
  }

  100% {
    opacity: 0.0;
  }

}

@keyframes fade {
  0% {
    opacity: 0.6;
  }
  100% {
    opacity: 0.0;
  }
}