forgeplus/app/views/admins/shared/modal/_message_modal.html.erb

<div class="modal fade admin-message-modal" tabindex="-1" role="dialog" aria-hidden="true">
  <div class="modal-dialog modal-dialog-centered" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title">消息</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body" style="max-height: 300px; overflow-y: scroll;">
        保存成功
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-primary submit-btn" data-dismiss="modal">确认</button>
      </div>
    </div>
  </div>
</div>