Layout bootstrap


<!DOCTYPE html>

<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>

</head>
<body>
<div class="container">
<header class="row bg-info">
<div class="col-md-12">
<h1>Cabecera</h1>
</div>
</header>
<main class="row">
<aside class="col-md-3 bg-success"><h1>hola</h1></aside>
<section class="col-md-9"><h1>que</h1></section>
</main>
<footer class="row bg-dark">
<div class="col-md-12">
<p class="text-light">Pie de la página</p>
</div>
</footer>
</div>
</body>
</html>