una/template/layout_3_columns.html

<!-- layout 3 columns [ start ] -->
<div id="__page_id__" class="bx-layout-wrapper bx-layout-3-columns">
    <div class="bx-layout-row flex">
        <div class="bx-layout-col bx-layout-3-columns-column1 bx-layout-column-thin w-1/3">
            <div class="bx-layout-cell pr-2 lg:pr-3" id="bx-layout-cell-1">
                __cell_1__
            </div>
        </div>
        <div class="bx-layout-col bx-layout-3-columns-column2 bx-layout-column-thin w-1/3">
            <div class="bx-layout-cell px-2 lg:px-3" id="bx-layout-cell-2">
                __cell_2__
            </div>
        </div>
        <div class="bx-layout-col bx-layout-3-columns-column3 bx-layout-column-thin w-1/3">
            <div class="bx-layout-cell pl-2 lg:pl-3" id="bx-layout-cell-3">
                __cell_3__
            </div>
        </div>
    </div>
    <bx_include_auto:_row_1_column_dump.html />
</div>
<!-- layout 3 columns [  end  ] -->