<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>W3C菜鸟教程(w3cdata.com)</title> <style> .center { text-align:center; } </style> </head> <body> <h1 class="center">标题居中</h1> <p class="center">段落居中。</p> </body> </html>