MediaWiki:Common.css

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/* 1. Kill any pseudo-element boxes generated at the bottom of the navigation sidebar */
#mw-site-navigation::before,
#mw-site-navigation::after,
#mw-site-navigation .sidebar-chunk::before,
#mw-site-navigation .sidebar-chunk::after,
.sidebar-chunk:last-child::before,
.sidebar-chunk:last-child::after {
    display: none !important;
    content: none !important;
    background: none !important;
    height: 0 !important;
}

/* 2. Target any leftover un-clickable wrapper containers and strip their white card styling */
#mw-site-navigation > div:last-child,
#mw-site-navigation .sidebar-chunk:last-child,
#mw-related-navigation > div:last-child {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    min-height: 0 !important;
}

/* 3. Re-apply the crisp white background only to populated chunks */
#mw-site-navigation .sidebar-chunk {
    background: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}