"Pure CSS Bootstrap 4 Cascading Drop Down Menu"
Bootstrap 4.1.1 Snippet by blayderunner123

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item"><a class="nav-link" href="#">Home</a></li>
<li class="nav-item"><a class="nav-link" href="#">Main Link One</a>
<!-- First Tier Drop Down -->
<ul>
<li class="nav-item"><a class="nav-link" href="#">Link One</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Two</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Three</a></li>
</ul>
</li>
<li class="nav-item"><a class="nav-link" href="#">Main Link Two</a>
<!-- First Tier Drop Down -->
<ul>
<li class="nav-item"><a class="nav-link" href="#">Link One</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Two</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Three</a>
<!-- Second Tier Drop Down -->
<ul>
<li class="nav-item"><a class="nav-link" href="#">Link One</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Two</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Three</a>
<!-- Third Tier Drop Down -->
<ul>
<li class="nav-item"><a class="nav-link" href="#">Link One</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Two</a></li>
<li class="nav-item"><a class="nav-link" href="#">Link Three</a></li>
</ul>
</li>
</ul>
</li>
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*, *: before, *:after {
-webkit-box-sizing: border-box !important;
-moz-box-sizing: border-box !important;
box-sizing: content-box !important;
}
/* CSS Document */
body {
font-size:22px;
line-height: 32px;
word-wrap:break-word !important;
width: 100%;
height: 100%;
font-family: "Source Sans Pro", "Helvetica Neue", Helvetica, Arial, sans-serif;
overflow-x: hidden;
}
html {
width: 100%;
height: 100%;
}
section:first-child{
position:relative;
margin-top:100px;
}
#container {
margin: 0 auto;
}
nav ul {
padding: 0;
margin: 0;
list-style: none;
position: relative;
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