una/template/search_result_block.html

<div id="__html_id__" class="__class__" __attrs__>__content__</div>
<bx_if:do_center>
    <script>
        $(document).ready(function() {
            bx_center_content('#__html_id__', '__selector_content__', true);
        });
    </script>
</bx_if:do_center>