#qrcode_value {
    text-align: center;
}

.logo {
    width: 128px;
}

nav {
    background-color: #002456;
    margin-bottom: 50px;
}

.brand-logo {
    height: 110px;
}

.f_center {
    display: flex;
    justify-content: center;
}

.f_column {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.lock {
    position: fixed;
    top: 0px;
    width: 100%;
    height: 100%;
    justify-content: center;
    display: none;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 999;
}