基于Bootstrap实现下图所示效果的页面，一个居中的标题和一个大按钮：
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <link href=" //netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet"> <title>Hello World</title> </head> <body> <div class="text-center"> <h3>Hello World!</h3> <button type="button" class="btn btn-primary" >我是按钮，按我一下</button> </div> <script src="http://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script> <script src="http://cdn.bootcss.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> </body> </html>