adastra_app/src/app/not-found.tsx

import { Container, Button } from "react-bootstrap";
const NotFound = () => {
    return (
        <section className="not-found-page">
            <Container className="page">
                <p className="error-message">⚠️ Cette page n&apos;existe pas.</p>
            </Container>
        </section>
    );
};

export default NotFound;