[BootStrap] Menu avec dropdown hover

Bonjour,

je cherche à faire un menu avec Bootstrap et dont les sous-menus s'afficheraient par survol de la souris (propriété CSS hover). J'ai trouvé avec Google un codepen qui fait ça : https://codepen.io/bsngr/pen/frDqh mais si je tente d'écrire un fichier équivalent, le CSS ne semble pas pris en compte et je ne vois pas où est mon bug. Peut-on m'aider ?

Code:

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="description" content="">
    <meta name="author" content="">
    <link rel="icon" href="../../../../favicon.ico">
 
    <title></title>
 
 
    <!-- <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">-->
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
 
    <!------ Include the above in your HEAD tag ---------->
    <link href="style.css" rel="stylesheet">
    <script src="script.js"></script>
  </head>
 
  <body>
 
    <div class="body-wrap">
        <div class="container">
          <nav class="navbar navbar-inverse" role="navigation">
            <div class="container-fluid">
              <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
                  <span class="sr-only">Toggle navigation</span>
                  <span class="icon-bar"></span>
                  <span class="icon-bar"></span>
                  <span class="icon-bar"></span>
                </button>
                <a class="navbar-brand" href="#">Brand</a>
              </div>
 
              <!-- Collect the nav links, forms, and other content for toggling -->
              <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav">
                  <li class="active"><a href="#">Link</a></li>
                  <li><a href="#">Link</a></li>
                  <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
                    <ul class="dropdown-menu">
                      <li><a href="#">Action</a></li>
                      <li><a href="#">Another action</a></li>
                      <li><a href="#">Something else here</a></li>
                      <li class="divider"></li>
                      <li><a href="#">Separated link</a></li>
                      <li class="divider"></li>
                      <li><a href="#">One more separated link</a></li>
                    </ul>
                  </li>
                </ul>
 
                <ul class="nav navbar-nav navbar-right">
                  <li><a href="#">Link</a></li>
                  <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
                    <ul class="dropdown-menu">
                      <li><a href="#">Action</a></li>
                      <li><a href="#">Another action</a></li>
                      <li><a href="#">Something else here</a></li>
                      <li class="divider"></li>
                      <li><a href="#">Separated link</a></li>
                    </ul>
                  </li>
                </ul>
              </div>
              <!-- /.navbar-collapse -->
            </div>
            <!-- /.container-fluid -->
          </nav>
        </div>
      </div>
 
    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
 
 
  </body>
</html>

Code:

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/* bootstrap dropdown hover menu*/
 
body {
    font-family: 'PT Sans', sans-serif;
    font-size: 13px;
    font-weight: 400;
    color: #4f5d6e;
    position: relative;
    background: rgb(26, 49, 95);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(26, 49, 95, 1)), color-stop(10%, rgba(26, 49, 95, 1)), color-stop(24%, rgba(29, 108, 141, 1)), color-stop(37%, rgba(41, 136, 151, 1)), color-stop(77%, rgba(39, 45, 100, 1)), color-stop(90%, rgba(26, 49, 95, 1)), color-stop(100%, rgba(26, 49, 95, 1)));
    filter: progid: DXImageTransform.Microsoft.gradient( startColorstr='#1a315f', endColorstr='#1a315f', GradientType=0);
  }
 
  .body-wrap {
    min-height: 700px;
  }
 
  .body-wrap {
    position: relative;
    z-index: 0;
  }
 
  .body-wrap:before,
  .body-wrap:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: -1;
    height: 260px;
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(26, 49, 95, 1)), color-stop(100%, rgba(26, 49, 95, 0)));
    background: linear-gradient(to bottom, rgba(26, 49, 95, 1) 0%, rgba(26, 49, 95, 0) 100%);
    filter: progid: DXImageTransform.Microsoft.gradient( startColorstr='#1a315f', endColorstr='#001a315f', GradientType=0);
  }
 
  .body-wrap:after {
    top: auto;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(26, 49, 95, 0) 0%, rgba(26, 49, 95, 1) 100%);
    filter: progid: DXImageTransform.Microsoft.gradient( startColorstr='#001a315f', endColorstr='#1a315f', GradientType=0);
  }
 
  nav {
    margin-top: 60px;
    box-shadow: 5px 4px 5px #000;
  }

Code:

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$('ul.nav li.dropdown').hover(function() {
    $(this).find('.dropdown-menu').stop(true, true).delay(200).fadeIn(500);
  }, function() {
    $(this).find('.dropdown-menu').stop(true, true).delay(200).fadeOut(500);
  });