Cómo cambiar el logotipo de Login en WordPress (II)

functions.php

<?php
function calfaro_custom_login_logo() { 
    echo '
        <style type="text/css">
        .login h1 a {
            background-image: url(' . get_stylesheet_directory_uri() . '/images/logo-calfaro.png);
            padding-bottom: 0px;
            width: 100%;
            background-size: contain;
        }
    </style>';
}    
add_action( 'login_enqueue_scripts', 'calfaro_custom_login_logo' );