anchor.diff:        <%= select_tag :membership_role, options_for_select(Membership::ROLES) %>
       </p>
   
  -      <p><%= f.submit t("devise.invitations.new.submit_button") %></p>
  +      <p><%= f.submit t("devise.invitations.new.submit_button"), :class => "btn btn-primary" %></p>
       <% end %>
   
     </div>
  
positive.code:         <li>
            <strong><%= membership.user.email %></strong> (<%= membership.role %>)
            <% if !membership.user.accepted_or_not_invited? %>
              <small class="bg-highlight">Invitation sent <%= time_ago_in_words(membership.user.invitation_sent_at) %> ago</small>
            <% end %>
          </li>
        <% end %>
  
negative.code:   <div class="column column-detail">
      <div class="column-heading">Settings</div>
  
      <p>To try out Helpful website, run this command in your terminal:</p>
  
      <pre>
        <code>
  