MediaWiki:Vector-2022.css

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/* Repeating texture behind the whole page */
body {
  background-color: PowderBlue;
  background-image: url("/w/images/your-wiki-background.png");
  background-repeat: repeat;
  background-size: 512px 512px;
  background-position: top center;
}

/* Single wide image across the top */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 360px;
  background-color: PowderBlue;
  background-image: url("/w/images/your-wiki-header.png");
  background-repeat: no-repeat;
  background-position: top center;
  background-size: cover;
  z-index: -1;
}