Thanks, that site has like 10 years online. I don't even remember the existance of divs when created. Years later was "updated" but the main structure wasn't moved to all css, because is a real pain to move the entire structure.
I do have content inside tables (not included for this example) but table don't reach the bottom of page as described. The ausence of "" was caused by a code "zipper" program that trimmed out spaces and unfortunatelly "" too.
Now is literally impossible to restore those on 300 pages of code.
No joy this far with prior suggestions