app/views/spree/flash_sales/_flash_sale.html.erb
<article class='flash-sale' id="flash_sale_<%= flash_sale.id %>" data-hook="flash-sale" itemscope itemtype='http://schema.org/Offer'>
<%= flash_sale.render_image %>
<h1 class='flash-sale-name'>
<%= link_to flash_sale.name, flash_sale.render_url, itemprop: 'name', title: flash_sale.name %>
</h1>
<div class='flash-sale-expires'>
Gone in: <span class='flash-sale-countdown' data-countdown="<%= flash_sale.countdown_format %>" data-layout="<%= flash_sale.countdown_layout %>"></span>
</div>
</article>