Maybe one additional hint. Please feel free to completely ignore it
.
It seams that there is no clear separation between what margin means and what header and footer means (configuration wise).
In my case I would like to increase the margins by 50 for example, keep the background for the margin transparent, but, I would like the header and footer to have a different background (for visibility purposes). However, the header and the footer should not occupy the whole margin. I hope it makes sense.
At the moment, I can change the background of the margin!! not the background of header and the footer.
Not a big issue I can still achieve the result I want that by adjusting the background image.
Thanks again for the support!