<div id="block">click me</div>
#block{
  	position:absolute;
    left: 50%;
    top: 50%;
    width: 100px;
    height: 100px;
    margin: -50px 0 0 -50px;
    background: #0c8;
    line-height: 100px;
    text-align: center;
    color: #fff;
    cursor: pointer;
    border-radius: 100%;
    transform-origin: 0 100px;
    transform: rotate(0deg);
  
    &.play {
      transform: rotate(360deg);
  	  transition: transform 2.0s linear;
    }
}
 block.addEventListener('click', function(){
  	block.className = 'play';
  });

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