MediaWiki:Vector.css

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/* CSS placed here will affect users of the Vector skin */
body {
    background-color: #f9f9f9;
    /* this assumes that your wiki is installed at '/w' in the web root */
    background-image: url('/w/skins/header_background.jpg');
    background-repeat: no-repeat;
}

#mw-page-base {
  background-image: none;
  background-color: transparent;
}