Well, if you need to scroll down to read the content, then this means either your content is too much for a page to show in one screen, or you are using a wrapper to shrink your page to a fixed width.
If the case is that you have much content, then just reduce the font size and other things, (make sure its legible).
If the case is that you have fixed width, then remove the wrapper, and just let it be a
liquid site.
If you want to do it dynamically with JavaScript, then you need to have a look at
availWidth and
style.width.
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