img{ 
    transform-origin:50% 50%;
    animation:2s rotateRight infinite linear; 
}

@keyframes rotateRight{
    100%{ transform:rotate(360deg); }
}
.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  /* bring your own prefixes */
  transform: translate(-50%, -50%);
}