OmniAuth sign in view

new.html.erb

<div class="signin-container">
  <h2>Sign in with</h2>

  <%- if devise_mapping.omniauthable? %>
    <ul class="image-list signin-icons">
      <%- resource_class.omniauth_providers.each do |provider| %>
        <li><%= link_to omniauth_authorize_path(resource_name, provider), :title => "Sign in with #{provider.to_s.titleize}" do %>
          <%= image_tag "oauth_#{provider}.png", :alt => "Sign in with #{provider.to_s.titleize}" %><% end -%>
        </li>
      <% end %>
    </ul>
  <% end -%>
</div>