spc-pleroma/lib/pleroma/web/templates/o_auth/o_auth/consumer.html.eex

<h2>Sign in with external provider</h2>

<%= form_for @conn, o_auth_path(@conn, :prepare_request), [method: "get"], fn f -> %>
  <%= render @view_module, "_scopes.html", Map.put(assigns, :form, f) %>

  <%= hidden_input f, :client_id, value: @client_id %>
  <%= hidden_input f, :redirect_uri, value: @redirect_uri %>
  <%= hidden_input f, :state, value: @state %>

    <%= for strategy <- Pleroma.Config.oauth_consumer_strategies() do %>
      <%= submit "Sign in with #{String.capitalize(strategy)}", name: "provider", value: strategy %>
    <% end %>
<% end %>