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

<div class="bx-base-text-unit bx-base-text-unit-gallery bx-def-gal-unit-size bx-def-margin">

    <bx_if:thumb>
        <a href="__content_url__"><img class="bx-base-text-unit-thumb bx-def-gal-img-size bx-def-round-corners bx-def-color-bg-sec bx-def-font-middle" alt="__summary_attr__" src="__thumb_url__" /></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-img-size bx-def-round-corners bx-def-color-bg-sec bx-def-font-middle bx-def-font-grayed bx-def-padding bx-def-box-sizing">__summary_plain__</div>
        </div>
    </bx_if:no_thumb>

    <div class="bx-def-gal-unit-column">
        <h2 class="bx-def-margin-sec-topbottom"><a href="__content_url__">__title__</a></h2>
    </div>

    <div class="bx-base-text-unit-info">
        <span class="bx-def-font-grayed">__entry_posting_date__</span>
        <span class="bx-base-text-unit-info-div bx-def-font-grayed">&#183;</span>
        <a href="__author_url__">__author__</a>
    </div>

</div>