app/views/layouts/embed.html.erb
<!DOCTYPE html>
<html>
<head>
<%= stylesheet_link_tag "embed", media: "all" %>
<%= csrf_meta_tags %>
<%= javascript_include_tag "embed" %>
<%= yield :head %>
</head>
<body data-locale="<%= I18n.locale %>">
<%= content_for?(:content) ? yield(:content) : yield %>
</body>
</html>