<div class="embed-container" style="position:relative;padding-bottom:<%= options[:document].inverted_aspect_ratio * 100 %>%;height:0;overflow:hidden;max-width:100%;">
  <%= content_tag :iframe, nil, { 
        src: options[:document].iframe_embed_src_url(data), 
        title: "Document “#{options[:document].title}” hosted by DocumentCloud", 
        sandbox: ['allow-scripts', 'allow-same-origin', 'allow-popups'], 
        frameborder: '0', 
        style: 'position:absolute;top:0;left:0;width:100%;height:100%;border:1px solid #aaa;border-bottom:0;box-sizing:border-box;' } %>
</div>

<div style="position:relative;padding-bottom:<%= options[:document].inverted_aspect_ratio * 100 %>%;height:0;overflow:hidden;max-width:100%;">
  <%= content_tag :iframe, nil, { 
        src: options[:document].iframe_embed_src_url(data), 
        title: "Document “#{options[:document].title}” hosted by DocumentCloud", 
        sandbox: ['allow-scripts', 'allow-same-origin', 'allow-popups'], 
        frameborder: '0', 
        style: 'position:absolute;top:0;left:0;width:100%;height:100%;border:1px solid #aaa;border-bottom:0;box-sizing:border-box;' } %>
</div>

Remove unused class on responsive iframe wrapper
Remove unused class on responsive iframe wrapper
