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$("#mydiv > div").css({
backgroundColor:"#CCC",
border:"solid 1px black"
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<div class="container-fluid">
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<div class="col-md-1">col-md-1</div>
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<html>
<head>
<meta charset="utf-8">
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<script src="http://cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link href="bootstrap.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="jquery-3.2.1.js"></script>
<script type="text/javascript">
$("#mydiv > div").css({
backgroundColor:"#CCC",
border:"solid 1px black"
});
</script>
<script type="text/javascript" src="bootstrap.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row" id="mydiv">
<div class="col-md-1">col-md-1</div>
<div class="col-md-1">col-md-1</div>
<div class="col-md-1">col-md-1</div>
<div class="col-md-1">col-md-1</div>
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<div class="col-md-1">col-md-1</div>
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<div class="col-md-1">col-md-1</div>
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