#quote .container .text-center img{
width: 20% !important;
animation-name: spin;
  animation-duration: 5000ms;
  animation-iteration-count: infinite;
  animation-timing-function: linear; 
}

@keyframes spin {
    from {
        transform:rotate(0deg);
    }
    to {
        transform:rotate(360deg);
    }
}