una/modules/base/text/template/unit_gallery.html

<div class="__class__ bx-base-text-unit bx-base-text-unit-gallery bx-def-gal-unit-size bx-def-padding-sec">
    <div class="bx-base-text-unit-cnt bx-def-box bx-def-round-corners bx-def-color-bg-box bx-def-box-sizing">
        <bx_if:thumb>
            <a href="__content_url__" title="__summary_attr__">
                <div class="bx-base-text-unit-thumb bx-def-gal-div-size bx-def-round-corners bx-def-font-middle" style="background-image:url(__gallery_url__)">
                    <div class="bx-base-text-unit-strecher">__strecher__</div>
                </div>
            </a>
        </bx_if:thumb>
        <bx_if:no_thumb>
            <div class="bx-def-gal-img-column">
                <div class="bx-base-text-unit-no-thumb bx-def-gal-div-size bx-def-font-middle bx-def-font-grayed bx-def-padding bx-def-box-sizing">
                    __summary_plain__
                    <div class="bx-base-text-unit-strecher">__strecher__</div>
                </div>
            </div>
        </bx_if:no_thumb>
        <div class="bx-base-text-unit-text bx-def-padding-leftright bx-def-padding-sec-topbottom bx-def-box-sizing">
            <h2><a href="__content_url__">__title__</a></h2>
            <div class="bx-base-text-unit-info">
                <bx_if:meta><div class="bx-base-general-unit-meta">__meta__</div></bx_if:meta>
            </div>
        </div>
    </div>
</div>