While I am working on a page, no matter what how much content I have ,when I go to preview that page, they come up about one and a half inchs short on each side of the browser. So the width is about three inchs narrower than the browser
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That is how the preview is seen. A lot of sites use this format so that computer monitors of smaller resolutions can display the whole website without the user having to scroll from side to side to see all the content.