MediaWiki:Common.css

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body.page-Main_Page #firstHeading,
body.page-Main_Page .firstHeading,
body.page-Main_Page h1.firstHeading {
    display: none !important;
}

body.page-Main_Page #siteSub,
body.page-Main_Page .mw-body h1,
body.page-Main_Page #contentSub {
    display: none !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
}