/**********************audio***********************/
.btn_music{
    display:inline-block;
    width:35px;
    height:35px;
    background:url('../../img/play.png') no-repeat center center;
    background-size:100% auto;
    position:absolute;
    z-index:100;
    left:15px;
    top:20px;
}
.btn_music.on{
    background-image:url('../../img/stop.png');
}

/******************************¶¯»­*************************/