更改

a.sm2_button, a.sm2_button.sm2_paused:hover {

a.sm2_button, a.sm2_button.sm2_paused:hover {

     background-image: none,url(http://ec2-3-92-244-220.compute-1.amazonaws.com/w/images/a/ad/AudioPlay.svg);

     background-image: none,url(http://ec2-3-92-244-220.compute-1.amazonaws.com/w/images/a/ad/AudioPlay.svg);

     background-size: 30px;

     background-size: 340px;

     background-repeat: no-repeat;

     background-repeat: no-repeat;

     background-position: center;

     background-position: center;

     width: 40px;

     width: 30px;

     height: 40px;  

     height: 30px;

     border-radius: 40px;

    vertical-align: middle;

     border-radius: 30px;

    transition: all 0.2s ease-in-out;

}

}