简单教程
提交运行
代码编辑器：
<!DOCTYPE htm> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <style>body {margin:10px}</style> <div class="well ">Hi, am in normal well !!</div> <div class="well well-lg">Hi, am in large well !!</div> <div class="well well-sm">Hi, am in small well !!</div>
运行结果：