<div class="uk-section uk-section-default uk-flex uk-flex-middle" uk-height-viewport>
    <div class="uk-width-1-1">
        <div class="uk-container uk-text-center">

            <button class="uk-button uk-button-default" type="button">Hover</button>
            <div class="uk-open" uk-drop="pos: bottom-center">
                <div class="uk-card uk-card-body uk-card-default uk-text-center">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</div>
            </div>

        </div>
    </div>
</div>