六分十秒左右的那段代码在chrome中打开的时候我的布局和响应式实现了，但是并没有实现灰色格格的样式，这个是什么原因呢，代码附上
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Protect Name</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="css/bootstrap.css">
<link href="http://getbootstrap.com/docs-assets/css/docs.css" rel="stylesheet">
<!-- [if lt IE9]
<script type="http://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
[endif] -->
</head>
<body>
<div>
<div class="row show-grid">
<div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
<div>.col-md-1</div>
</div>
</div>
</div>
</body>
</html>
