Override login page with Panels I want to override the login page using panels. I found a tutorial that shows me how to do it using Panels Everywhere, but that overrides the whole page (with site_template).  I just want to override the page content.

Is this possible?
You can override existing paths with the Page Manager Existing Pages Module.

I have not used it with a login page but it works well for other cases. You can use it to override an existing page's path and then add the original content for that path as a panels pane alongside your custom additions.