MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Hide 'View history' tab for anonymous users */
body:not(.loggedin) li#ca-history {
    display: none !important;
}

/* Hide 'Recent changes' link in sidebar for anonymous users */
body:not(.loggedin) #n-recentchanges,
body:not(.loggedin) a[title="Special:RecentChanges"] {
    display: none !important;
}