在設計網頁布局的時候，經常會有大屏內容的顯示jumbotron
顧名思義該組件可以增加標題的大小，並為登陸頁面內容添加更多的外邊距（margin）。
源碼中可以看出：
如果jumbotron放在container樣式內，則顯示圓角;如果不放在裡邊，則不會顯示圓角。
<!DOCTYPE html><html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <!-- Bootstrap從3.0版本開始全面支援移動平台，貫徹移動先行宗旨 --> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Bootstrap 101 Template</title> <!-- Bootstrap --> <link href="bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <!-- 超大螢幕jumbotron： 1.建立一個帶有 class .jumbotron. 的容器 <div> 2.除了更大的 <h1>，字型粗細 font-weight 被減為 200--> <div class="jumbotron"> <h1>Hello,world!</h1> <p>This is a simple hero unit.</p> <p><button class="btn btn-primary">Learn more</button></p> </div> <!-- bootstrap是基於jQuery--> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> <script src="bootstrap-3.3.7-dist/js/bootstrap.min.js"></script> </body></html>
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