body {
    background: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.container {
    max-width: 400px;
}

.card {
    border-radius: 10px;
}

.card-header {
    background: #007bff;
    color: white;
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
}

.btn-primary {
    background: #007bff;
    border: none;
}

.btn-primary:hover {
    background: #0056b3;
}