salve a tutti
ho un menu, che se visto da cellulare deve diventare a cascata

qui è il codice:
codice HTML:
 <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>
   <nav class="navbar navbar-default">
        <div class="container-fluid">
          <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
              <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="#">Menu</a>
          </div>
          <div id="navbar" class="navbar-collapse collapse" aria-expanded="false" style="height: 1px;">
            <ul class="nav navbar-nav">
              <li class="active"><a href="#">Home</a></li>
              <li><a href="Jobs.aspx">Jobs</a></li>
              <li><a href="Tools.aspx">Tools</a></li>
              <li><a href="Materials.aspx">Materials</a></li>
              <li> <a href="Rapportino.aspx">Manage</a></li>
              <li class="dropdown">
            </ul>
            
          </div><!--/.nav-collapse -->
        </div><!--/.container-fluid -->
      </nav>
purtroppo il risultato è disastroso se lo guardo da chrome

cosa sbaglio?