app/views/devise/_omniauth_form.html.erb
<% if oauth_logins.any? %>
<div class="row">
<div class="small-12 column">
<div class="margin-bottom">
<strong><%= t("omniauth.info.#{action}") %></strong>
</div>
</div>
<% oauth_logins.each do |login| %>
<div class="small-12 medium-6 large-4 column end">
<%= link_to t("omniauth.#{login}.name"), send("user_#{login}_omniauth_authorize_path"),
title: t("omniauth.#{login}.#{action}"),
class: "button-#{login.to_s.delete_suffix("_oauth2")} button expanded",
method: :post %>
</div>
<% end %>
<div class="small-12 column auth-divider">
<span><%= t("omniauth.or_fill") %></span>
</div>
</div>
<% end %>