una/modules/boonex/notifications/template/etemplate_preview.html

<div class="__style_prefix__-etemplate-preview">
    <div class="__style_prefix__-etemplate-preview-cnt">
        <div class="__style_prefix__-etp-row">
            <div class="font-bold"><bx_text:_bx_ntfs_txt_et_preview_subject /></div>
            <div>__subject__</div>
        </div>
        <div class="__style_prefix__-etp-row mt-4">
            <div class="font-bold"><bx_text:_bx_ntfs_txt_et_preview_body /></div>
            <div>__body__</div>
        </div>
    </div>
</div>