MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
body {
    background-image: url('/skins/Vector/resources/images/pt_viewer_background.png');
    background-repeat: no-repeat;
}
body.ns-3000 #mw-head {
    background-image: url('/skins/Vector/resources/images/pt_viewer_background.png');
    background-repeat: no-repeat;
}