body {
    background-color: #f0f2f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
}

.container {
    max-width: 700px;
}

.card {
    border: none;
    border-radius: 15px;
}

.header {
    background-color: #007bff;
    color: white;
    padding: 20px;
    border-radius: 15px 15px 0 0;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    transition: background-color 0.3s ease;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #004085;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* Optional: Custom styling for form elements */
.form-control, .form-select {
    border-radius: 8px;
    padding: 10px 15px;
}