#qr-reader {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

#scan-result {
    margin-top: 20px;
    display: none;
}

.btn-scan {
    margin: 10px;
}

.alert {
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 4px;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}