any way to get white margin around text?

[Jean Louis]

I would like to get margin around the text, let us say 2 lines from
top and 4 columns from the left side. The marging should not be
indentation or something that is part of text, but rather only visual.

The command `set-left-margin' does not do what I mean, it sets margin
but is part of the text. I just would like it visually separated form
the window borders to gain better nicer note display.