Bootstrap CSS class .carousel-dark

    <div id="carouselExample" class="carousel carousel-dark slide" data-bs-ride="carousel">
        <ol class="carousel-indicators">
            <li data-bs-target="#carouselExample" data-bs-slide-to="0" class="active"></li>
            <li data-bs-target="#carouselExample" data-bs-slide-to="1"></li>
            <li data-bs-target="#carouselExample" data-bs-slide-to="2"></li>
        </ol>
        <div class="carousel-inner">
            <div class="carousel-item active">
                <img src="https://via.placeholder.com/800x450" class="d-block w-100 bg-secondary" style="height:250px;" alt="photo 1">
                <div class="carousel-caption d-none d-md-block">
                    <h5>First slide label</h5>
                    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
                </div>
            </div>
            <div class="carousel-item">
                <img src="https://via.placeholder.com/800x450" class="d-block w-100 bg-secondary" style="height:250px;" alt="photo 2">
                <div class="carousel-caption d-none d-md-block">
                    <h5>Second slide label</h5>
                    <p>Lorem ipsum dolor sit amet consectetur adipisicing.</p>
                </div>
            </div>
            <div class="carousel-item">
                <img src="https://via.placeholder.com/800x450" class="d-block w-100 bg-secondary" style="height:250px;" alt="photo 3">
                <div class="carousel-caption d-none d-md-block">
                    <h5>Thirs slide label</h5>
                    <p>Lorem ipsum dolor sit amet consectetur adipisicing.</p>
                </div>
            </div>
        </div>
        <a class="carousel-control-prev" href="#carouselExample" role="button" data-bs-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="visually-hidden">Previous</span>
        </a>
        <a class="carousel-control-next" href="#carouselExample" role="button" data-bs-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="visually-hidden">Next</span>
        </a>
    </div>