MediaWiki:Common.css

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/* === Global background: banner top-left + dark left column + parchment === */
:root{
  --hf-banner-h: 150px;   /* banner height */
  --hf-leftcol-w: 320px;  /* left column width (match sidebar ~300–360px) */
  --hf-parchment: #E1DCCE;
  --hf-left-top: #2F2D2B;
  --hf-left-bot: #1E1E1D;
}

/* Page background has THREE layers; nothing else gets sized/shifted */
html, body {
  background:
    url("/Special:FilePath/BannerImage.png") left top no-repeat,                    /* 1) banner strip */
    linear-gradient(to bottom, var(--hf-left-top), var(--hf-left-bot)) left top repeat-y, /* 2) dark column */
    var(--hf-parchment);                                                            /* 3) parchment base */
  background-size:
    var(--hf-leftcol-w) var(--hf-banner-h),  /* banner only in left column area */
    var(--hf-leftcol-w) 100%,                /* column runs full height */
    auto;
  background-attachment: fixed, fixed, fixed; /* true page background */
}

/* Header + sidebar should NOT paint their own backgrounds */
#mw-head,
.vector-header-container,
#mw-page-base, #mw-head-base,
#mw-panel, #column-one, .mw-sidebar {
  background: transparent !important;
}

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

/* (Optional) Sidebar link colors over the dark column */
#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; }