.icon_button3{
    display: inline-block;
    vertical-align: middle;
    width: 56px;
    height: 56px;
    /* here will be replace sprite image path, and auto set the background-position */
    background: transparent url("style4_z.png") no-repeat 0px 0px;

}

.icon_shake3{
    display: inline-block;
    vertical-align: middle;
    width: 45px;
    height: 45px;
    /* here will be replace sprite image path, and auto set the background-position */
    background: transparent url("style4_z@2x.png") no-repeat 0px 0px;
-webkit-background-size: 90px 45px;
background-size: 90px 45px;
}

.icon_root{
    display: inline-block;
    vertical-align: middle;
    width: 45px;
    height: 45px;
    /* here will be replace sprite image path, and auto set the background-position */
    background: transparent url("style4_z@2x.png") no-repeat -45px 0px;
-webkit-background-size: 90px 45px;
background-size: 90px 45px;
}