Last but not least, we need to edit the login.component.html file and add the <login-facebook></login-facebook> element to the end of our existing login form:
[...]<div class="login-link"> <a [routerLink]="['/register']"> Don't have an account? Click here to create one! </a></div><login-externalproviders></login-externalproviders>[...]
That way, the Login with Facebook button will be shown immediately after the standard login UI interface.