This really doesn't make sense. The browser places the site in the centre of the open window, regardless of how large the window is re-sized to. This is because the placement is dynamic based on the window width which is constanty recalculated. There must be a way through HTML to dynamically place the site in the centre dynamically regardless of window
height. I've seen this done without margins. I'll have to peek into the HTML page code.
UPDATE: this can be done through CSS code,
see this discussion.
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