BOOTSTRAP EXAMPLE:
<html l">
<head>
<title>Bootstrap Example</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<h1>Hello World!</h1>
<p>Resize the browser window to see the effect.</p>
<div class="row">
<div class="col-sm-12" style="background-color:lavender;padding:10px">
<div class="container">
<div class="row">
<div class="col-sm-12" style="margin:0px auto;background-color:green;height:200px;" >Hello</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-12" style="margin:0px auto;background-color:blue;height:60px;margin-top:20px;" >Hello</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-8" style="margin:0px auto;background-color:green;height:600px;margin-top:20px;" >content</div>
<div class="col-sm-4" style="margin:0px auto;background-color:green;height:600px;margin-top:20px;width:360px;margin-left:20px;" >sidebar</div>
</div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-12" style="margin:0px auto;background-color:blue;height:60px;margin-top:20px;" >footer</div>
</div>
</div>
</body>
</html>
OUTPUT:
<html l">
<head>
<title>Bootstrap Example</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<h1>Hello World!</h1>
<p>Resize the browser window to see the effect.</p>
<div class="row">
<div class="col-sm-12" style="background-color:lavender;padding:10px">
<div class="container">
<div class="row">
<div class="col-sm-12" style="margin:0px auto;background-color:green;height:200px;" >Hello</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-12" style="margin:0px auto;background-color:blue;height:60px;margin-top:20px;" >Hello</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-8" style="margin:0px auto;background-color:green;height:600px;margin-top:20px;" >content</div>
<div class="col-sm-4" style="margin:0px auto;background-color:green;height:600px;margin-top:20px;width:360px;margin-left:20px;" >sidebar</div>
</div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-12" style="margin:0px auto;background-color:blue;height:60px;margin-top:20px;" >footer</div>
</div>
</div>
</body>
</html>
OUTPUT:
