MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
#p-logo, .generated-sidebar, #p-lang, #p-tb, #p-search {
    display: none;
}
#content.mw-body {
    margin-left: 0.2em; /* Adjusts content to reclaim the empty space */
}

/* Hide the sidebar panel */
div#mw-panel {
    display: none;
}

/* Adjust content area to use full width */
#content, #mw-head-base, div#footer {
    margin-left: 0;
    margin-right: 0;
}