With Publisher 2000 (later versions no, older versions ???) you can add a
<center> and </center> in EACH html file which will center your page.  Every
time you save your web files it will require you to again add the <center>
and </center>.  I did this for awhile, a short while.

Another thing you can do is under File, Page Setup, select a wide page.
This will make the display better for most folks but it will require those
with monitor settings of 640x480 to scroll horizontally.  I think to avoid
scrolling one needs their monitor set at 1024x1068 and above.  The wide page
setting will allow you to put more on your web page.

looks unbalanced. I realise the size is optimised for browser windows that
are not maximised, because it fits perfectly then, but is there anything I
can do to make it look good in both?