I think first store the CSS as file in 'clientscripts/vbulletin_css' folder (chmod first 777)
You can find this option to store css as file in vbulletin option
and then, you can link that css file to your external pages!
Like-
Quote:
<link rel="stylesheet" type="text/css" href="http://www.yoursite.com/clientscript/vbulletin_css/style-0000000.css" id="vbulletin_css" />
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