@keyframes rotate {
    from { transform: rotate( 0deg ); }
    to   { transform: rotate( 360deg ); }
  }
  
  @-webkit-keyframes rotate {
    from { -webkit-transform: rotate( 0deg );   }
    to   { -webkit-transform: rotate( 360deg ); }
  }
  
  .loading {
    -webkit-animation-name: rotate;
    -webkit-animation-duration: 0.5s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-timing-function: linear;
    animation-name: rotate;
    animation-duration: 0.5s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
  }