.kf-box {
    text-align: center;
    color: #FFFFFF;
    padding: .2rem;
    background-color: #353535;
    display: none;
    position: fixed;
    top: 4.7rem;
    left: 50%;
    margin-left: -1.75rem;
    width: 3.5rem;
    opacity: 0.9;
    border-radius: .2rem;
    /*background: #fff;*/
    z-index: 30;
    font-size: 0.2rem;
}