I want to add a div for my content between a fixed footer and header.
The height of the header and footer may change. So I don't want any paddings or margins that refer to the height of the footer or header.
In other words: I want to be able to change the size of the footer or header in a single place without usage of css preprocessors .
I have seen many examples but they all used hardcoded references to the height of the header or footer. I don't want these.
Is this possible at all? If so I would like to know.
Here a example of what I'm trying to do: