I was wanted to make my blog’s site width large around 1400px, but adjust when people are viewing it on a lower resolution or as they adjust the browser width. A good example of this would be http://mashable.com. CSS-Tricks does this a little as well with adjusting the layout of the menu. I’m not sure if this can be done with only CSS.
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you mean max-width? max-width defines the largest the wrapper can be, in your case, 1400px, where width defines the size, so 100% means fill the page, unless the page is larger than 1400px..in which case, it stops growing there.