anchor.diff:  
   <div class="container">
       <div class="row">
  +        <div class="col-xs-12">
  +            <ul class="nav nav-tabs nav-justified">
  +                <%= active_link_to 'Przegląd', course_path(@course), wrap_tag: :li, active: :exclusive %>
  +                <li><a href="#">Oceny</a></li>
  +                <li><a href="#">Terminy</a></li>
  +                <li><a href="#">Aktywność</a></li>
  +                <li><a href="#">Informacje</a></li>
  +                <li><a href="#">Ustawienia</a></li>
  +            </ul>
  +        </div>
  +    </div>
  +    <div class="row row-separator"></div>
  +    <div class="row">
           <div class="col-xs-12 col-md-9 col-md-push-3">
               <div id="course-jumbo" class="jumbotron" style="border-color: <%= string_to_pastel "#{@course.name}#{@course.id}" %>">
                   <h1><%= @course.name %></h1>
  
positive.code:                 <p><%= @course.description %></p>
                  <% end %>
              </div>
              <div class="panel panel-default">
                  <div class="panel-heading">Lorem ipsum dolor sit amet.</div>
                  <ul class="list-group">
  
negative.code:             </div>
          </div>
          <div class="col-xs-12 col-md-3 col-md-pull-9">
              <div class="panel panel-default">
                  <div class="panel-heading">
                      <a href="#" class="btn btn-default btn-xs pull-right">Więcej</a>
  