MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Hide the "Discussion" tab for all pages */
li#ca-talk {
    display: none !important;
}
/* Hide the "View history" tab */
li#ca-history {
    display: none !important;
}
/* Hide the "View source" tab (appears instead of "Edit" on protected pages) */
li#ca-viewsource {
    display: none !important;
}