MediaWiki:Common.css

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/* === Global background: banner (top-left), top strip, left column, parchment === */
:root{
  --hf-banner-w: 1250px;   /* banner width */
  --hf-banner-h: 150px;    /* banner height */
  --hf-leftcol-w: 320px;   /* left column/sidebar width */
  --hf-parchment: #E1DCCE;
  --hf-left-top: #2F2D2B;
  --hf-left-bot: #1E1E1D;
}

html, body { margin: 0 !important; }

html, body {
  background:
    /* TOPMOST: banner patch */
    url("/Special:FilePath/BannerImage.png") left top no-repeat,
    /* under banner: full-width top strip so header color is solid */
    linear-gradient(to bottom, var(--hf-parchment) 0, var(--hf-parchment) var(--hf-banner-h)) left top no-repeat,
    /* left column runs down the page */
    linear-gradient(to bottom, var(--hf-left-top), var(--hf-left-bot)) left top repeat-y,
    /* base parchment */
    var(--hf-parchment);
  background-size:
    var(--hf-banner-w) var(--hf-banner-h),  /* banner */
    100% var(--hf-banner-h),               /* top strip */
    var(--hf-leftcol-w) 100%,              /* left column */
    auto;
  background-attachment: scroll, scroll, scroll, scroll;
}

/* keep chrome transparent so the page background shows */
#mw-page-base, #mw-head-base, #mw-head, .vector-header-container,
#mw-panel, #column-one, .mw-sidebar { background: transparent !important; }

/* content stays opaque parchment so the dark column doesn't bleed underneath */
#content, .mw-body, .vector-body .mw-body,
.mw-workspace-container, .mw-content-container {
  background: var(--hf-parchment) !important;
}

/* optional: readable sidebar links */
#mw-panel, #column-one, .mw-sidebar { color: #EEEDEB !important; }
#mw-panel a, #column-one a, .mw-sidebar a { color: #EEEDEB !important; text-decoration: none; }
#mw-panel a:hover, #column-one a:hover, .mw-sidebar a:hover { color: #5A65EA !important; text-decoration: underline; }