I don't believe you can, the WYSIWYG editor has a specific size in pixels, so you'd have to shrink the outer table down - and then you'd have an "unsightly" area there anyway.
Besides, what if your screen is a different size than someone else's screen? Say you have a standard 4:3 monitor and one of your users has a newer 16:9... Or vice versa? Don't you think it would look terrible to one of your or the other?
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