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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> * { box-sizing: border-box; } .header { border: 1px solid red; padding: 15px; } .menu { width: 25%; float: left; padding: 15px; border: 1px solid red; } .main { width: 75%; float: left; padding: 15px; border: 1px solid red; } </style> </head> <body> <div class="header"> <h1>Shanghai</h1> </div> <div class="menu"> <ul> <li>The Flight</li> <li>The City</li> <li>The Island</li> <li>The Food</li> </ul> </div> <div class="main"> <h1>The City</h1> <p>Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai! </p> <p>请调整浏览器窗口的大小，来查看内容如何响应调整大小。</p> </div> </body> </html>