.qrcode-body{
    width: 100%;
    text-align: center;
    margin-top: 150px;
}

p.remark{
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 14px;
    font-weight: 400;
    color:  black;
}

@media screen and (max-width: 400px){
    .qrcode-body {
        margin: 0;
    }
    body{
        margin: 0;
    }
}