login.erb

<div class="navbar">
    <div class="navbar-inner">
        <div class="container">
            <a href="#" class="brand">
                <img src="images/logo.png" width="140" height="60" alt="Logo" /> <center>ÁREA DE SERVIÇO</center>
                <!-- Logo EVA HAIR FASHION -->
            </a>
            <!-- Barra de navegação -->
            <button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
                <i class="icon-menu"></i>
            </button>
            <!-- Menu principal -->
            <div class="nav-collapse collapse pull-right">
                <ul class="nav" id="top-navigation">
                    <li class="active"><%= link_to 'Voltar ao Site', '/' %></li>
                    <li><%= link_to 'Administração', new_admin_user_session_path %></li>
                </ul>
            </div>
            <!-- Fim do Menu principal -->
        </div>
    </div>
</div>
<%= form_tag ({ controller: 'web/sessions', action: 'create' }) do %>
  Senha: <%= password_field_tag(:password, nil, class: '', id: '') %><br>
  <%= submit_tag 'Prosseguir', class: '', id: '' %>
<% end %>