thanks. it works.
I used custom page address. since i set config, i cannot find page-id in admin post edit page. but i can find page-id with developer tool in webbrowser.
but what if, the short page’s height is depend on the contents like containing the page collect post from visitor? it means that sometimes it’s short but finally it will be longer than window size.? then footer is cover contents area. do I have to use jquery?
regards.