<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-container-small">

            <div class="uk-child-width-1-3@s uk-grid-small" uk-grid>
                <div>
                    <div class="uk-panel uk-background-muted uk-height-small">
                       <h3 class="uk-position-center uk-h5">Small</h3>
                    </div>
                </div>
                <div>
                    <div class="uk-panel uk-background-muted uk-height-medium">
                       <h3 class="uk-position-center uk-h5">Medium</h3>
                    </div>
                </div>
                <div>
                    <div class="uk-panel uk-background-muted uk-height-large">
                       <h3 class="uk-position-center uk-h5">Large</h3>
                    </div>
                </div>
            </div>

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