Hot answers tagged responsive-design
If you let if run full width, the text will be very annoying to read. The ideal line length is somewhere between 50 and 100 characters. You could increase the font, sure, but then you'd have to move your head more. So we try to keep text lines shorter. And left aligned with a huge amount of whitespace on the right is just ugly.
To expand on the answer given by @PixelSnader there are also occupational health and safety (OH&S) implications regarding head movement. There is a lot of research indicating that while sitting at a computer the screen should be set up so that you can read the screen with very little movement of your head, neck and shoulders. If a website was designed ...
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