MediaWiki:Vector.css

/* ================================
   FOR ANONYMOUS USERS ONLY
   ================================ */

/* Hide all sidebar portals (navigation, toolbox, etc.) */
body:not(.mw-user-loggedin) #mw-panel .portal {
    display: none !important;
}

/* Show the logo always */
body:not(.mw-user-loggedin) #p-logo,
body:not(.mw-user-loggedin) #p-logo a,
body:not(.mw-user-loggedin) #p-logo a img {
    display: block !important;
    visibility: visible !important;
}

/* Show personal tools (top login link) */
body:not(.mw-user-loggedin) #p-personal {
    display: block !important;
}

/* Add dummy space under the logo for layout */
body:not(.mw-user-loggedin) #mw-panel::after {
    content: '';
    display: block;
    height: 400px;
}

/* ================================
   NOTHING hidden for logged-in users!
   ================================ */

/* Important: Do NOT override .portal for mw-user-loggedin at all */
/* Reset sidebar for logged-in users */
body.mw-user-loggedin #mw-panel .portal {
    display: block !important;
    visibility: visible !important;
}