login.html.erb

<div class="login">
  <% form_tag do -%>
  <p><label for="login">Login</label><br/>
  <%= text_field_tag 'login' %></p>

  <p><label for="password">Password</label><br/>
  <%= password_field_tag 'password' %></p>

  <!-- Uncomment this if you want this functionality
  <p><label for="remember_me">Remember me:</label><%= check_box_tag 'remember_me' %></p>
  -->

  <p><%= submit_tag 'Log in' %></p>
  <% end -%>
</div>