2 container 容器个类
样例
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>无标题文档</title>
<link rel="stylesheet" href="css/bootstrap.min.css"/>
<script src="js/bootstrap.min.js"></script>
<script src="js/jquery.min.js"></script>
</head>
<body>
<div class="container-fluid" style="background-color:#CCC;height:200px;">
</div>
</body>
</html>