ruby on rails - How to assign a different design to each button with oauth? -

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i want allow customers connect facebook , g+ auth. problem don't know how assign different design each button, because link call each provider. how can call them distinctly ?

here's view's code : 

        <%- if devise_mapping.omniauthable? %>       <%- resource_class.omniauth_providers.each |provider| %>         <%= link_to omniauth_authorize_path(resource_name, provider) %>         <div class="fb-connect"> <%= image_tag('f-facebook.png', alt: "fb", class: "mini-fb") %>&nbsp;&nbsp;inscription avec facebook</div>         <% end %>      <% end %>     <% end %>

as understand, 2 buttons (fb + g+) looks facebook button.

here's omniauth_callbacks_controller.rb:

class omniauthcallbackscontroller < devise::omniauthcallbackscontroller def self.provides_callback_for(provider) class_eval %q{ def #{provider} @user = user.find_for_oauth(env["omniauth.auth"], current_user)  if @user.persisted? sign_in_and_redirect @user, event: :authentication set_flash_message(:notice, :success, kind: "#{provider}".capitalize) if is_navigational_format? else session["devise.#{provider}_data"] = env["omniauth.auth"] redirect_to new_user_registration_url end end } end  [:twitter, :facebook, :linkedin, :google_oauth2].each |provider| provides_callback_for provider end  def after_sign_in_path_for(resource) if resource.email_verified?     super resource     else     finish_signup_path(resource) end end end


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