* {
    padding: 0;
    margin: 0;
}
#pageBody{
    min-height:100vh !important;
}
.card{
    max-width: 700px !important;
}
#submitBtn{
    margin: 0 auto !important;
}
#qrcode img{
    max-width: 100% !important;
    width: 90% !important;
    margin: 0 auto !important;
}