body {
    background-color: #f8f9fa;
}

.qr-code {
    max-width: 300px;
    margin: 0 auto;
}

.card {
    border-radius: 15px;
    overflow: hidden;
}

.navbar {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.table th {
    background-color: #e9ecef;
}