.play_menu {
    position: absolute;
    bottom: 50px;
    right: 15px;
    width: 60px;
    height: 60px;
    opacity: 0.75;
    z-index:9999;
    background: url(../img/playBtn.png) no-repeat right bottom;
}

.stop_menu {
    position: absolute;
    bottom: 50px;
    right: 15px;
    width: 60px;
    height: 60px;
    opacity: 0.75;
    z-index:9999;
    background: url(../img/stopBtn.png) no-repeat right bottom;
}