MediaWiki:Common.css

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/* 1. Reset base wrapper styling so empty containers stay invisible */
#mw-site-navigation .sidebar-inner {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
}

/* 2. Hide any sidebar chunk on main/content pages that lacks actual links */
#mw-site-navigation .sidebar-chunk:not(:has(a)) {
    display: none !important;
}

/* 3. Explicitly hide the language and secondary tool containers when unpopulated */
#p-lang,
#p-lang-sidebar,
.mw-portlet-lang,
#p-tb-label {
    display: none !important;
}