The simple, elegant way that works with all modern browsers (now more than 99% of browsers overall) is to use CSS (cascading style sheets). Wrap your entire page in a <div> element with a width attribute, like this:
<div style="width: 2000">
Your page body goes here
Notice that a horizontal scrollbar appears to allow the entire 2,000-pixel width to be seen, even though the content in this simple example doesn't come close to requiring it.
The old-fashioned way that works with all web browsers, including truly ancient browsers like Netscape 4.x, is to use an image as a "brace" to prop the window open at the desired minimum width. Use a 1x1 transparent GIF image. Then use the following HTML:
<img src="transparent.gif" width="2000" height="1"><br>
This will force the page to be at least 2000 pixels wide, creating a scrollbar if necessary.
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