#ipv6 {
    display: inline-block;
    margin-left: 4px;
    margin-right: 4px;
    padding: 0 5px;
    border: 1px solid #9da3a6;
    border-radius: 2px;
}

/* Reference: https://ipw.cn/doc/ipv6/server/ipv6_sign.html
Modified from it. */