Bootstrap CSS class .btn-close-white

    <div class="alert bg-dark alert-dismissible fade show text-white" role="alert">
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Quasi quae voluptatibus excepturi, pariatur dolor perferendis deleniti quas.</p>
        <button type="button" class="btn-close btn-close-white" data-bs-dismiss="alert" aria-label="Close"></button>
    </div>