app/templates/auth/social.html

{% extends "single.html" %}

{% block title %}Social Login{% endblock %}
{% block single_content %}

  <div class="card">
    <div class="card-body p-6">
      <div class="card-title text-center">Social login</div>
      {% if GITHUB_CLIENT_ID %}

        <a href="{{ url_for('auth.github_login', next=next_url) }}"
           class="btn btn-block btn-social btn-github">
          <i class="fa fa-github"></i> Sign in with GitHub
        </a>
      {% endif %}
      {% if GOOGLE_CLIENT_ID %}

        <a href="{{ url_for('auth.google_login', next=next_url) }}"
           class="btn btn-block btn-social btn-google">
          <i class="fa fa-google"></i> Sign in with Google
        </a>
      {% endif %}
      {% if FACEBOOK_CLIENT_ID %}

        <a href="{{ url_for('auth.facebook_login', next=next_url) }}"
           class="btn btn-block btn-social btn-facebook">
          <i class="fa fa-facebook"></i> Sign in with Facebook
        </a>
      {% endif %}
    </div>
    <div class="text-center p-3"
         style="font-size: 12px; font-weight: 300; margin: auto">
      <span class="badge badge-warning">Warning</span>
      Please note that social login is now <b>deprecated</b>.
      <br />
      <br />
      Though practical, these social providers do not respect your privacy and therefore we recommend using
      email/password.
    </div>
  </div>
  <div class="text-center text-muted mt-2">
    <a href="{{ url_for('auth.register') }}">Sign up</a>
    /
    <a href="{{ url_for('auth.login') }}">Login</a>
  </div>
{% endblock %}