Untitled

<body>

<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Scooters Tuner</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarResponsive">

      <div class="dropdown">
        <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Tuning Type
        </button>
        <div class="dropdown-menu tuning-selection" aria-labelledby="dropdownMenuButton">
          <a class="dropdown-item tuning-selection" id="guitar_standard" href="tunings/guitar_standard.html">Guitar(Standard)</a>
          <a class="dropdown-item tuning-selection" id="guitar_drop_d" href="tunings/guitar_drop_d.html">Guitar(Drop D) </a>
          <a class="dropdown-item tuning-selection" id="bass_standard" href="tunings/bass_standard.html">Bass Standard</a>
          <a class="dropdown-item tuning-selection" id="mandolin_standard" href="tunings/mandolin_standard.html">Mandolin</a>

        </div>
      </div>

      <ul class="navbar-nav ml-auto">
        <li class="nav-item active">
          <a class="nav-link" href="#">About
            <span class="sr-only">(current)</span>
          </a>
        </li>
      </ul>

    </div>
  </div>
</nav>

<!-- Page Content -->
<div class="container">
  <div class="row">
    <div class="col-lg-12">
      <div class="where-you-tune">


      </div>
    </div>
  </div>
</div>

<!-- Bootsrap Core JS -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<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>
<script type="text/javascript">

$(document).ready(function(){

        $('a.tuning-selection').click(function(e){
            e.preventDefault();
            $('.where-you-tune').load($(this).attr('href'));
        });
    });

</script>

</body>
</html>