app/views/layouts/content_only.html.erb
<!DOCTYPE html>
<html lang="<%= current_language %>">
<head>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<title><%= html_title %></title>
<%= csrf_meta_tag %>
<%= stylesheet_link_tag 'jquery/jquery-ui-1.11.0', 'application', 'responsive', :media => 'all' %>
<%= stylesheet_link_tag 'rtl', :media => 'all' if l(:direction) == 'rtl' %>
<%= javascript_heads %>
<%= heads_for_theme %>
<!-- page specific tags -->
<%= yield :header_tags -%>
</head>
<body class="<%= body_css_classes %>">
<div id="wrapper">
<div id="main" class="nosidebar">
<div id="content">
<%= yield %>
<div style="clear:both;"></div>
</div>
</div>
</div>
</body>
</html>