code在Bootstrap里的用法:meta name="viewport" content="width=device-width, initial-scale=1"
输入标签kbd的用法:Ctrl+V

        meta name="viewport" content="width=device-width, initial-scale=1"
        link rel="stylesheet" href="css/bootstrap.min.css" type="text/css"
    
i 默认是斜体 程序结果为: Hello Bootstrap