SOURCE

<div class='panoramic'></div>

@keyframes panoramic{
  to {background-position:100% 0;}
}
.panoramic{
  width:300px;
  height:200px;
  background:url(http://pic.90sjimg.com/back_pic/qk/back_origin_pic/00/03/88/dc98489c7cd843578f414f0f470f9995.png);
  background-size:auto 100%;
  animation:panoramic 5s infinite alternate;
  animation-play-state:paused;
}
.panoramic:hover,.panoramic:focus{
  animation-play-state:running;
}