Foundation 提醒框
Foundation 可以很简单的创建一个提醒框：
提醒框可以使用 .alert-box 类创建, 可以添加可选的类： .secondary, .success, .info, .warning 或 .alert:
实例
This is a default alert box.
This is a secondary alert box.
Success! This alert box indicates a successful or positive action.
Info! This alert box indicates a neutral informative change or action.
Warning! This alert box indicates a warning that might need attention.
Alert! This alert box indicates a dangerous or potentially negative action.
