#bgm{position: absolute;top:.5rem;right:.1rem;z-index:9999;}
#bgm #audio-btn{width: .75rem;height: .75rem; margin:0;background-size: 100% 100%;}
#bgm .on{background: url('/Content/images/music_on.png') no-repeat 0 0;-webkit-animation: rotating 2s linear infinite;animation: rotating 2s linear infinite;}
#bgm .off{background: url('/Content/images/music_off.png') no-repeat 0 0;}
@-webkit-keyframes rotating {
	from{
		-webkit-transform: rotate(0deg);
		-moz-transform: rotate(0deg);
		-ms-transform: rotate(0deg);
		-o-transform: rotate(0deg);
    	transform: rotate(0deg);
	}
	to{
		-webkit-transform: rotate(360deg);
		-moz-transform: rotate(360deg);
		-ms-transform: rotate(360deg);
		-o-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}
@keyframes rotating {
    from{
        -webkit-transform: rotate(0deg);
		-moz-transform: rotate(0deg);
		-ms-transform: rotate(0deg);
		-o-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    to{
        -webkit-transform: rotate(360deg);
		-moz-transform: rotate(360deg);
		-ms-transform: rotate(360deg);
		-o-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}