Bootstrap CSS class .flex-xxl-column

    <div class="d-flex flex-xxl-column bg-secondary p-1">
        <div class="p-3 bg-primary">1</div>
        <div class="p-3 bg-warning">2</div>
        <div class="p-3 bg-primary">3</div>
        <div class="p-3 bg-warning">4</div>
    </div>