MediaWiki:Vector.css

/* ------------------------------
   HIDE sidebar portals for anon
------------------------------- */

/* Hide all sidebar content blocks (navigation, toolbox, etc.) for anonymous users */
body:not(.mw-user-loggedin) #mw-panel .portal {
    display: none;
}

/* Keep the logo visible */
body:not(.mw-user-loggedin) #p-logo {
    display: block;
}

/* Ensure the logo image shows up */
body:not(.mw-user-loggedin) #p-logo a,
body:not(.mw-user-loggedin) #p-logo a img {
    display: block;
    visibility: visible;
}

/* Keep personal tools (login link) visible */
body:not(.mw-user-loggedin) #p-personal {
    display: block;
}

/* Add a fake empty block for visual balance */
body:not(.mw-user-loggedin) #mw-panel::after {
    content: '';
    display: block;
    height: 400px; /* Tweak this value */
    background: transparent;
}

/* ------------------------------
   LOGGED-IN USERS: No override needed
   Let default styling show everything
------------------------------- */

/* Remove any display overrides that may have crept in */
body.mw-user-loggedin #mw-panel .portal {
    display: block;
    visibility: visible;
}