function Button({ label, variant = "primary", onClick }) {
    return (
        <button
            className={`btn btn-${variant}`}
            onClick={onClick}
        >
            {label}
        </button>
    );
}

// Utilisation
<Button label="Envoyer" onClick={() => console.log('Envoyé')} />
<Button label="Annuler" variant="secondary" onClick={handleCancel} />