Bootstrapping Devise New Registration View on Rails 4.2.0 with Bootstrap 3

devise_registrations_new.html.erb

<div class="container">
  <div class="row">
    <div class="col-sm-4 col-sm-offset-4">
      <div class="light-well">
        <h2 class="page-header text-center">Sign Up</h2>

        <%= form_for resource, as: resource_name, url: registration_path(resource_name),
                      html: { class: "form-horizontal center"} do |f| %>

          <div class="form-group">
            <%= f.email_field :email, autofocus: true, placeholder: "Email Address", class: "form-control" %>
          </div>

          <div class="form-group">
            <%= f.password_field :password, autocomplete: "off", placeholder: "Password", class: "form-control" %>
          </div>

          <div class="form-group">
            <%= f.password_field :password_confirmation, autocomplete: "off", placeholder: "Confirm Password", class: "form-control" %>
            <% if @validatable %>
              <p class="help-block"><%= @minimum_password_length %> characters minimum</p>
            <% end %>
          </div>

          <div class="actions">
            <%= f.submit "Sign up", class: "btn btn-success btn-lg btn-block" %>
          </div>
          <%= devise_error_messages! %>
        <% end %>
      </div>
      <br>
      <br>
      <%= render "devise/shared/links" %>
    </div>
  </div>
</div>