관리자 -> 게시판관리 ->해당 게시판 수정 -> 상단내용 (첨부이미지 참조)

html 버튼 클릭

<div class="container">
  <h2>Alerts</h2>
  <div class="alert alert-success">
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
  </div>
  <div class="alert alert-info">
    <strong>Info!</strong> This alert box could indicate a neutral informative change or action.
  </div>
  <div class="alert alert-warning">
    <strong>Warning!</strong> This alert box could indicate a warning that might need attention.
  </div>
  <div class="alert alert-danger">
    <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action.
  </div>
</div>

부트스트랩 Alerts 소스 입니다.
호환되는듯하니 수정하셔서 사용하시면 될 것 같습니다.
수고하세요.