Theme: different logos on login page and other pages

In my theme.css I have body { background: transparent url(images/layout/logo1234.png) } which works. Is there a way to tell Mendix to use a different logo file on the login page? In the CSS, I see .mx-login.modal-body element, but setting background there doesn't help because it's for the modal popup. Any ideas on how this can be achieved? Again, this is a theme derived from the Layout app. Thanks.
1 answers

you probably need to using a padding-top or margin-top to display the logo by pushing the form attributes down.