<% content_for :page_specific_css do %> <%= stylesheet_link_tag "lib/main-forms" %> <% end %> <%= form_for @part, url: update_sub_part_page_part_path(@subpart), :remote=>true, html: { class: "form-horizontal main-forms"} do |f| %> <%= render :partial => "form", :locals => { :f => f } %> <% end %>