<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="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <form action="/pagina-processa-dados-do-form" method="post"> <div> <label for="name">Nome:</label> <input type="text" id="name" /> </div> <div> <label for="mail">E-mail:</label> <input type="email" id="mail" /> </div> <div> <label for="msg">Mensagem:</label> <textarea id="msg"></textarea> </div> <div class="button"> <button type="submit">Enviar sua mensagem</button> </div> </form>