#swt_cen {
    width: 4.05rem;
    height: 3.6rem;
    position: fixed;
    left: 50%;
    top: 50%;
    margin: -1.2rem 0 0 -2.025rem;
    background: url(/static/img/swt_210819.png) no-repeat;
    background-size: 100% 100%;
    z-index: 999;
    border-radius: .15rem;
}
#swt_cen a:nth-child(1) {
    left: 0;
}
#swt_cen a {
    display: inline-block;
    width: 50%;
    height: 96px;
    position: absolute;
    bottom: 0;
    text-align: center;
    line-height: 80px;
    color: #000;
    font-size: 16px;
    text-indent: -9999px;
    overflow: hidden;
}

#swt_cen a:nth-child(2) {
    right: 0;
}
#swt_cen b {
    display: block;
    width: .5rem;
    height: .5rem;
    position: absolute;
    right: -.005rem;
    top: -.005rem;
    cursor: pointer;
    background: url(/static/img/col-b.png) no-repeat;
    background-size: 100% 100%;
 }