一个简单的倒计时工作牌，可以拉伸，字体随窗口变化，每隔一定时间自动隐藏到通知栏，过一定时间可以再次弹出，适合新手学习C#。-A simple countdown work card, can be stretched, with the font window changes at regular intervals to auto-hide the notification bar, over a period of time can pop up again, suitable for be