.center {
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.center img {
    margin: 25px;
    max-width: 100%;
    max-height: 100%;
    width: 400px;
}
.center .qrcode_area {
    text-align: center;
}
.center .qrcode {
    margin: 25px;
    max-width: 100%;
    max-height: 100%;
}
.center .fa_logo {
    margin: 25px;
    max-width: 100%;
    max-height: 100%;
}
.center .line_logo {
    margin: 25px;
    max-width: 100%;
    max-height: 100%;
    width: 300px;
}

.message{
    text-align: center;
    margin: 25px;
    font-size: 1rem;
    color: #333;
    max-width: 100%;
    max-height: 100%;
}
@media screen and (max-width: 767px) {
    .qrcode_area{
        display: none;
    }
    .center img {
        width: 75%;
    }
}