you should use a separate css file for printing the page or use css3 media queries:
<link rel="stylesheet" href="css/print.css" type="text/css" media="print"/>
using percentage values its the best option when you create a css print file.
body, html, #wrapper {
width: 100%;
}
or in your main css file:
@media print {
body, html, #wrapper {
width: 100%;
}
}
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