Limiting the size of screen with css
<p>How would I set the minimum width of a webpage?
I thought it would be easy, turns out not...</p>

<p>I want to make it so that, for example, when the screen width is smaller than, say, 1000px, the content to be shown at the size as if the screen was at 1000px but with the scroll bar at the bottom (preferably with css but I can deal with Javascript). </p>

<p>I've read applying <code>min-width</code> to <code>body</code> would do this, but it doesn't (at least on Chrome and Safari).</p>