MediaWiki:Common.css

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/* Hide left sidebar */
#mw-panel {
  display: none !important;
}

#content,
.mw-body,
#footer {
  margin-left: 1em !important;
}

/* Williams logo in the top bar on every page */
#mw-head {
  padding-left: 280px;
}

#mw-head::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  width: 260px;
  height: 80px;
  background: url("/images/YOUR-LOGO-FILE.png") left center no-repeat;
  background-size: contain;
  z-index: 200;
}