Wiki/MediaWiki:Common.css

/* Safe top-left banner for Vector-2022 (no pseudo-elements) */ .skin-vector-2022 .vector-header-container {

 --hf-banner-h: 140px;
 background-color: var(--hf-bg, #E1DCCE);
 background-image:
   url("/wiki/Special:FilePath/BannerImage.png"),
   linear-gradient(to right, rgba(0,0,0,0) 0%, var(--hf-bg, #E1DCCE) 85%);
 background-repeat: no-repeat, no-repeat;
 background-position: left top, left top;
 background-size: auto var(--hf-banner-h), 100% var(--hf-banner-h);
 border-bottom: 2px solid var(--hf-border-strong, #BFB69C);
 min-height: var(--hf-banner-h);

}