<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- https://medium.com/wdstack/bootstrap-is-still-better-than-css-grid-for-creating-layouts-522b7baf0411-->
<!--
py - adds padding
col- declares how much space an element should take up in 12-col grid ( ex: col-sm-12 means " take up 12 columns if small format screen ")
bg-
-->
<div class="container-fluid">
<div class="row">
<div class="header col-12 bg-primary py-3">
Header
</div>
</div>
<div class="row">
<div class="nav col-12 bg-info">
Navigation
</div>
</div>
<div class="container-fluid">
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