old_contents: from flask import render_template
  
  from . import auth
  
  @auth.route('/login')
  def login():
    return render_template('auth/login.html')
  
new_contents: from flask import render_template
  
  from . import auth
  from .forms import LoginForm
  
  @auth.route('/login', methods=['GET', 'POST'])
  def login():
    form = LoginForm()
  
    if form.validate_on_submit():
        pass
  
    return render_template('auth/login.html', form=form)
  
subject: Add the login form to the auth routes