#Download {
    width: 786px;
    height: 98px;
    text-align: center;
    position: absolute;
    top: 927px;
    left: 50%;
    margin-left: -341px;
    z-index: 51;
    border-radius: 5px;
    background: url() no-repeat left top;
}
#Download .btn_down_s1 {
	float: left; animation: sc 2s infinite linear;
	width: 341px;
	height: 98px;
	text-indent: -999em;
	background: url(../image/btn_down1.png) no-repeat left top;
}
#Download .btn_down_s2 {
	float: left; animation: sc 2s infinite linear;
	width: 411px;
	height: 98px;
	text-indent: -999em;
	margin-left: 30px;
	background: url(../image/btn_down2.png) no-repeat left top;
}
#Download .btn_down_s1:hover {
	background: url(../image/btn_down1.png) no-repeat left bottom;
}
#Download .btn_down_s2:hover {
	background: url(../image/btn_down2.png) no-repeat left bottom;
}

@keyframes sc {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(0.8);
    }

    100% {
        transform: scale(1);
    }
}