I am using Vaadin 13s' new component LoginOverlay. I want to add background image using setTitle() as shown here.

```
        loginOverlay = new LoginOverlay();
        loginOverlay.setOpened(true);
        Component titleComponent = new Image();
        ((Image) titleComponent).setSrc("frontend/img/seven-oceans.jpg");
        loginOverlay.setTitle(titleComponent);
        loginOverlay.setDescription("Insert Employee Id and Password");
        loginOverlay.setAction("login");
        loginOverlay.addForgotPasswordListener(e->{
            Notification.show("Forgot password not yet handled", 30, Notification.Position.TOP_CENTER);
        });
        add(loginOverlay);

```

But, no image is loading.