anchor.diff:  <div class="notification_wrapper">
  -  <a class="dropdown_notification">
  -    <p>Notifications · <%= @target.unopened_notification_count %></p>
  -  </a>
  +  <%= link_to open_all_notifications_path_for(@target), method: :post, remote: true, class: "dropdown_notification" do %>
  +    <p><span class="<%= 'unopened' if @target.has_unopened_notifications? %>"><%= @target.unopened_notification_count %></span></p>
  +  <% end %>
     <div class="notification_list_wrapper">
       <%= yield :notification_index %>
     </div>
  
positive.code:     overflow: scroll;
      border: 1px solid #e5e5e5;
      position: absolute;
      right: -10px;
      background-color: #fff;
    }
  
negative.code:   .notification_wrapper .dropdown_notification{
      cursor: pointer;
    }
    .notification_wrapper .dropdown_notification p span{
      color: #fff;
      background-color: #e5e5e5;
      border-radius: 4px;
      font-size: 12px;
      padding: 4px 8px;
    }
    .notification_wrapper .dropdown_notification p span.unopened{
      background-color: #f87880;
    }
    .notification_wrapper.open .notification_list_wrapper {
      display: block;
    }
  