#Download {
    width: 930px;
    height: 107px;
    text-align: center;
    position: absolute;
    top: 876px;
    left: 50%;
    margin-left: -414px;
    z-index: 51;
    border-radius: 5px;
}
#Download .btn_down_s1 {
    float: left;
    width: 347px;
    height: 107px;
    text-indent: -999em;
    margin-right: 152px;
    animation: sc 2s infinite linear;
    background: url(../image/down.png) no-repeat left top;
}
#Download .btn_down_s2 {
    float: left;
    width: 347px;
    height: 107px;
    text-indent: -999em;
    margin-left: 10px;
    animation: sc 2s infinite linear;
    background: url(../image/cz.png) no-repeat left top;
}

@keyframes sc {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.8);
    }
    100% {
        transform: scale(1);
    }
}