Layout bootstrap responsive


<!DOCTYPE html>
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<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<style>
header{
height: 20vh;
}

footer{height:10vh;}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">

</div>
</div>

<div class="row">
<div class="col-md-2 col-sm-12">

</div>
<div class="col-md-8 col-sm-9">

</div>
<div class="col-md-2 col-sm-3">

</div>
</div>

<div class="row">
<div class="col-md-12">

</div>
</div>

</div>
</body>
</html>