/* Standardmäßig (für kleinere Geräte) */
.login-bg {
    background-image: url('/assets/img/login.jpg');
}

/* Für Desktops ab 992px (Bootstrap "lg" breakpoint) */
@media (min-width: 1800px) {
    .login-bg {
        background-image: url('/assets/img/login_wide.jpg');
    }
}