[WP] Brand login

login.php

<?php defined('ABSPATH') or header('Location: /');
/**
 * Admin login form
 */

add_action('login_enqueue_scripts', function() {
  $upload_dir = wp_upload_dir();
  echo '<style>#login h1 a, .login h1 a {background-image:url('.$upload_dir['baseurl'].'/site/login.svg);background-size:72px}</style>';
});

add_filter('login_headertext', function() {
  return get_bloginfo('name');
});

add_filter('login_headerurl', function() {
  return home_url();
});