.rating-star{

}
.rating-star span{
    width:30px;
    height:30px;
    display:block;
    float:left;
    background-image:url("../images/star-rate.png");
    background-repeat:no-repeat;
    background-size:100%;
    margin:0px 2px;
    cursor:pointer;
    background-position:top;
  }

  .rating-star span.clicked,.rating-star span.hover{
    background-position:bottom;
  }