html,
body {
    height: 100%;
}

body {
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #f5f5f5;
}

.qrCore-img {
           align-content:center;
}

.error-message{
    color: #D12628;
    font-weight: bold;
}

main{
    padding-top:40px;
    padding-bottom: 40px;
}