body {
    margin: 0;
    background: #2e2e2c;
}
* {
    -webkit-tap-highlight-color: transparent;
}
::selection {
    color: #e0e0e0;
    background: rgba(255,64,129,.35);
}
#rin-bg {
    position: fixed;
    inset: 0;
    background-size: cover;
    background-position: center;     /* 垂直、水平都居中 */
    background-image: url('http://guui.cn/assets/img/background.jpg');
}
#rin-bg:after {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    content: '';
    z-index: -1;
    position: fixed;
    background-color: rgba(66,66,66,.6);
}

#rin-footer {
    bottom: 0;
    margin: auto;
    width: 100vw;
    position: absolute;
    padding: 10px 0 10px 0;
}
#rin-footer div {
    font-size: 14px;
    text-align: center;
    color: rgba(255,255,255,.79);
}
#rin-footer div a {
    color: #2196f3;
    font-weight: 700;
    transition: all .3s;
    text-decoration: none;
}
.rin-tr {
    width: 80%;
    height: 2px;
    margin: auto;
    background: rgba(255,255,255,.3);
}