js issue

 <section id="Serviços">
			<!-- ##############  DE ONDE SAIO E PARA ONDE QUERO VOLTAR ############### -->
            <div class="container" id="tam">
                <br>
                <div class="wow fadeIn" data-wow-delay="1000ms">
                    <h2 class="text-center color-white-menu"> Serviços </h2>
                </div>
                <div class="wow fadeIn" data-wow-delay="1100ms">
                    <p class="text-center color-white-menu">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
                </div>
                <br>
                <div class="row">
                    <div class="col-md-4 col-sm-12 col-xs-12" class="tam">
                        <!--div class="wow fadeInLeft hidden-xs hidden-sm" data-wow-delay="1300ms">
                            <div class="Em_Cima img-responsive">
                                <div class="Em_Baixo img-responsive"></div>
                            </div>
                        </div-->
                        <div class="col-12 container-drag">
                            <img src="img/charmander.jpg" width="300" height="200" alt="" />
                                <div class="black_white">
                                    <img src="img/charizard.jpg" width="300" height="200"  alt="black_white" />
                                </div>
                        </div>
                        <br>
                        <div class="wow fadeIn" data-wow-delay="2000ms">
                            <h3 class=" color-white-menu">Especificação do produto: </h3>
                            <ul>
                                <li class="color-white-menu"> <i class="fa fa-paperclip" aria-hidden="true"></i> Tipo da folha: <span class="span_tamanho"> A3 </span></li>
                                <li class="color-white-menu"> <i class="fa fa-arrows-h" aria-hidden="true"></i> Largura: <span class="span_tamanho"> 000 cm</span></li>
                                <li class="color-white-menu"> <i class="fa fa-arrows-v" aria-hidden="true"></i> Comprimeto: <span class="span_tamanho"> 000 cm</span></li>
                            </ul>
                            <p class="color-white-menu"> Quer saber mais sobre: </p>
                            <a class="btn-lg btn-warning" data-toggle="collapse" data-target="#Saiba-Mais_2" href="#Saiba-Mais_2"  id="vai"> Clica aqui <i class="fa fa-envelope-open-o" aria-hidden="true"></i></a>
                        </div>
                    </div>
                </div>

				<!-- ##############  PARA ONDE VENHO(até aqui funciona normal) ############### -->
                <div id="Saiba-Mais_2" class="collapse" style="padding-top: 100px;">
                    <div class="well" id ="here">
                        <div class="row">
                            <div class="col-md-6 col-sm-12">
                                <img src="img/800x400/01.jpg" class="img img-responsive foto">
                            </div>
                            <div class="col-md-6 col-sm-12">
                                <h4 class="text-center cor_titulo"> A3 </h4>
                                <p class="color-white-menu">"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.".</p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>




//JAVASCRIPT


$("#vai").click(function(e) {
    e.preventDefault();
    var id = $(this).attr('href');
   // console.log(id); //saibamais2
    var  target = $(id).offset().top; // distancia que vai ter que percorrer top-href
    // console.log(target); // 1480
    var  heightNav = $('#tam').innerHeight();

    $('html, body').animate({
        scrollTop:  target + heightNav
    }, 1000)
})