<nav class="navbar navbar-default navbar-static-top">
        <div class="container">
            <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>

                <ul class="nav navbar-nav">
                  <li class=""><a href="home.php">Home</a></li>
                  <li class="dropdown">
                    <a class="dropdown-toggle" data-toggle="dropdown" href="#">Cadastro
                    <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                      <li><a href="inserir_pessoa.php">Cadastro de clientes</a></li>
                      <li><a href="#">x</a></li>
                      <li><a href="#">x</a></li>
                    </ul>
                  </li>
                  <li class="dropdown">
                    <a class="dropdown-toggle" data-toggle="dropdown" href="#">Consultas
                    <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                      <li><a href="consulta_clientes.php">Consulta de clientes</a></li>
                      <li><a href="#">x</a></li>
                  </ul>
                </ul>
            </div>



            <div id="navbar" class="navbar-collapse collapse">
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="sair.php">Sair</a></li>
                </ul>
            </div><!--/.nav-collapse -->
        </div>
    </nav>