<style>
  body    { padding-top:0px; }

  .dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
    top:75%;
  }

 .navbar-brand {
   padding: 10px 10px !important;
 }

 .dropdown-toggle:hover > .caret{
  transform: rotate(90deg);
}
</style>  

<nav class="navbar fixed-top navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a href="/"><img style="height: 160px; top: -54px; position: absolute " class="navbar-brand" src="/images/logo.png" ></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 navbar-right">
        <li><a href="/">Dashboard</a></li>
        <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Miners<span class="caret"></span></a>
          <ul class="dropdown-menu">
              <li><a href="/miners">List</a></li>
              <li><a href="/layout">Layout</a></li>
          </ul>
        </li>        
        <li><a href="/provision">Provision</a></li>
        <li><a href="/tickets">Tickets</a></li>
        <li><a href="/logout">Log out</a></li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>