body {
    background-color: #232842;
    color: white;
}
.content {
    text-align: center;
    margin: 30px 0;
}
.qrcode {
    display: inline-block;
    width: 320px;
}
.beian {
    font-size: 12px;
    margin-top: 120px;
}
.beian a {
    color: white;
}
@media screen and (max-width: 480px) {
    .qrcode {
        width: 80%;
    }
}