<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <style> #MAIN{ margin-top:200px; text-align: center; } </style> <body> <div id="MAIN"> <h2 >您的浏览器版本过低，请升级您的浏览器（最低支持IE9）！</h2> </div> </body> </html>
