body {
    max-width: 860px;
    margin: 0 auto;
    position: relative;
}

#top {
    position: absolute;
    font-size: 18px;
    align-items: center;
    height: 50px;
    line-height: 50px  ;
    background: hsla(0, 0%, 40%, .8);
    width: 100%;
    color: #fff;
    z-index: 999;
}

#top a {
    color: #fff;
    margin-left: 8px;
}

#top a.lxwm {
    height: 36px;
    line-height: 36px;
    border-radius: 18px;
}

#service {
    z-index: 999;
    position: fixed;
    right: 10px;
    border: 1.5px solid rgb(250, 53, 52);
    bottom: 120px;
    width: 40px;
    height: 40px;
    font-size: 28px;
    color: rgb(250, 53, 52);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}