anchor.diff:            <div class="controls">
               <%= f.text_field :last_name, autocomplete: "off", tabindex: 3 %>
               <% if @user.errors[:last_name].any? %>
  -              <span class="inline-help"><%= @user.errors[:last_name] %></span>
  +              <span class="help-inline"><%= @user.errors[:last_name].first %></span>
               <% end %>
             </div>
           </div>
  
positive.code:           <div class="controls">
              <%= f.email_field :email, autocomplete: "off", required: true, tabindex: 4 %>
              <% if @user.errors[:email].any? %>
                <span class="inline-help"><%= @user.errors[:email] %></span>
              <% end %>
            </div>
          </div>
  
negative.code:           <div class="controls">
              <%= f.text_field :username, autocomplete: "off", required: true, tabindex: 1 %>
              <% if @user.errors[:username].any? %>
                <span class="help-inline"><%= @user.errors[:username].first %></span>
              <% end %>
            </div>
          </div>
  