MediaWiki:Vector.css

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/* Force sidebar visible */
.vector-main-menu-pinned-container {
    display: block !important;
    width: 220px !important;
    min-width: 220px !important;
}
.vector-main-menu-pinned-container .vector-main-menu {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}
.vector-feature-main-menu-pinned-disabled .vector-main-menu-pinned-container {
    display: block !important;
}
/* Make sidebar content visible */
.mw-sidebar {
    display: block !important;
    visibility: visible !important;
}