[PHP 7] Menu déroulant Bootstrap

Bonjour,

Help : je ne parviens pas à mettre en oeuvre ce menu déroulant avec Bootstrap :

Code:

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		<div class="container nav">
			<div class="navbar effect shift navbar-expand-lg " style="margin: 0 auto;">
				<a class="nav-item nav-link" href="#" ><i class="fa fa-fw fa-home fa-lg" style="color: blue"></i> <span class="font-navbar">Home</span></a> 
				<a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false" href="#" ><i class="fa fa-fw fa-calculator fa-lg" style="color: blue"></i><span class="font-navbar">Devis</span></a> 
				<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
				  <a class="dropdown-item" href="#">Créer un nouveau devis</a>
				  <a class="dropdown-item" href="#">Mes devis</a>
				</div>
				<a class="nav-link dropdown-toggle" href="#" ><i class="fa fa-fw fa-cogs fa-lg" style="color: blue"></i> <span class="font-navbar">Administrer</span></a>
<!--
				<a href="#" ><i class="fa fa-fw fa-dolly-flatbed fa-lg" style="color: blue"></i> <span class="font-navbar">Mes commandes</span></a> 
				<a href="#" ><i class="fas fa-fw fa-address-card fa-lg" style="color: blue"></i> <span class="font-navbar">Mes clients</span></a>
-->
			</div>
		</div>

Et dans le head :

Code:

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    <head>
        <title>Aqua-Cover Calculateur</title>
        <meta charset="utf-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1, , shrink-to-fit=no">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
        <script src="https://unpkg.com/popper.js/dist/umd/popper.min.js"></script>
	   	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
        <link href='http://fonts.googleapis.com/css?family=Holtwood+One+SC' rel='stylesheet' type='text/css'>
        <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" integrity="sha384-UHRtZLI+pbxtHCWp1t77Bi1L4ZtiqrqD80Kn4Z8NTSRyMA2Fd33n5dQ8lWUE00s/" crossorigin="anonymous">