anchor.diff:              </li>
               <li class="header">POST TYPES</li>
               <% Cms9::PostDefinition.all.each do |post_def| %>
  -              <li>
  +              <li class="<%= 'active' if params[:post_definition_id] == post_def.id.to_s %>">
                 <%= link_to posts_path(post_definition_id: post_def.id) do %>
                   <i class="fa fa-edit" aria-hidden="true"></i> <%= post_def.name.pluralize %>
                 <% end %>
  
positive.code:         </section>
        </aside>
  
        <aside class="right-side">                
          <section class="content">        
            <%= yield %>
          </section>
        </aside>
  
negative.code: 
  
      <div class="wrapper row-offcanvas row-offcanvas-left">
        <aside class="left-side sidebar-offcanvas">
          <section class="sidebar">
            <ul class="sidebar-menu">
              <li class="header">MAIN NAVIGATION</li>
  