<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <nav class="navbar navbar-expand navbar-dark bg-dark"> <a href="index.html" class="navbar-brand">Home</a> <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarSupportedContent"> <ul class="navbar-nav mr-auto"> <a href="#" class="nav-item active nav-link">Quem somos</a> <a href="#" class="nav-item active nav-link">Nossa história</a> <a href="#" class="nav item active nav-link">Localidades</a> <li class="nav-item dropdown"> <a href="#" class="nav-link dropdown-toggle active" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Nossos serviços</a> <div class="dropdown-menu" aria-labelledby="navbarDropdown"> <a href="#" class="dropdown-item">Divisão Militar</a> <a href="#" class="dropdown-item">Divisão Corporativa</a> <a href="#" class="dropdown-item">Aplicações para a área de saúde</a> </div> </li> </ul> <form action="#" method="post" class="form-inline my-2 mylg-0"> <input type="search" name="buscar" id="buscar" class="form-control mr-sm-2" placeholder="Buscar em todo o site" aria-label="Buscar"> <button class="btn btn-outline-success" type="submit">Pesquisar</button> </form> </div> </nav>