MediaWiki:Common.css

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• Edge: Hold Ctrl while clicking Refresh, or press Ctrl-F5.

/* CSS placed here will be applied to all skins */
/* Global Watermark */
body {
    background-image: url("/wiki/images/your-watermark.png");
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;
    background-size: 60%;
}