How to add a custom logo in WordPress login page

custom-admin-logo.php

function my_login_logo() { ?>
  <style type="text/css">
    #login h1 a, .login h1 a {
    background-image: url(<?php echo get_stylesheet_directory_uri(); ?>/img/nelio-icon.png);
      height: 84px;
      width: 84px;
      background-size: cover;
      background-repeat: no-repeat;
    }
  </style>
<?php }//end my_login_logo()
add_action( 'login_enqueue_scripts', 'my_login_logo' );

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

function my_login_logo_url_title() {
  return 'Nelio Software';
}//end my_login_logo_url_title()
add_filter( 'login_headertitle', 'my_login_logo_url_title' );