MediaWiki:Vector.css

/* All CSS here will be loaded for users of the Vector skin */
/* All CSS here will be loaded for users of the Vector skin */
/* Suppress red links for Vector skin */
a.new, a.new:visited {
    color: inherit !important;
    pointer-events: none !important;
    text-decoration: none !important;
}

#mw-head-base::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -5px; /* Offsets 70px from the left */
  width: calc(100% - 70px); /* Prevents overflow on the right */
  height: 70px;
  background: url("https://asxresearch.org/images/8/8d/ASX-Header-Banner_trans2.png") no-repeat left center;
  background-size: contain;
  opacity: 1.00;
  z-index: 0;
}

#mw-head-base {
  position: relative !important;
  height: 111px !important;
  background: none !important;
  z-index: 1;
}

#p-personal, #left-navigation, #right-navigation {
  position: relative;
  z-index: 2;
}

.vector-menu-tabs {
  margin-top: 8px !important;
}