Tienda virtual – not found

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title><?php echo TITLE . ' - Pagina no encontrada'; ?></title>
    <link rel="stylesheet" href="<?php echo BASE_URL; ?>assets/css/bootstrap.min.css">
</head>

<body class="d-flex h-100 text-center text-white bg-dark">

    <div class="cover-container d-flex w-100 h-100 p-3 mx-auto flex-column">

        <main class="px-3">
            <h1>Not Found.</h1>
            <p class="lead">La página que buscas no existe</p>
            <p class="lead">
                <a href="<?php echo BASE_URL; ?>" class="btn btn-lg btn-secondary fw-bold border-white bg-white text-dark"><?php echo TITLE; ?></a>
            </p>
        </main>
    </div>

</body>

</html>