MediaWiki:Common.css

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#firstHeading,
.mw-page-title-main,
.mw-page-title {
    display: none !important;
}

/* Remove empty title wrapper spacing */
.mw-body-header,
.mw-page-titlebar,
.mw-body-header-container {
    display: none !important;
}

/* Pull content up */
.mw-body,
.mw-page-container {
    margin-top: 0 !important;
    padding-top: 0 !important;
}