#login h1 a, .login h1 a {
    background-image: url('https://nguyenphudung.com/sites/default/files/styles/thumbnail/public/2021-07/logo%20dung%20v2%401x.png');
}
body{
    background-image: url("https://nguyenphudung.com/sites/default/files/2021-09/backgound-wp-login.jpg");
    background-attachment: fixed;
    background-size: cover;
    width: 100%;
    height: 100%;
}