Yeah, using the # will make it fit (50%) but the fonts will be probably pretty small for him. I am actually surprised that the default browser does not have a "Fit to screen" mode, even though I like the normal layout and use it all the time.
Another way you can do is go to options while in page, settings, screen size change it from "select keys only" to "full screen", then reload the page you're on, see if you like that mode better.
-H