<html><head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css"> <script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script> <script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Jumbotron</h2> <p>The .jumbotron class indicates a big box for calling extra attention to featured content or information:</p> <div class="jumbotron"> <h1>Hello World!</h1> <p>Look over here!</p> </div></div></body></html>