MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
/* Hide "edit / edit source" next to headings everywhere */
.mw-editsection,
.mw-editsection-like {
  display: none !important;
}
/* Hide left sidebar */
.vector-column-start {
    display: none !important;
}

/* Expand content to full width */
.vector-column-end {
    margin-left: 0 !important;
}

.mw-page-container {
    grid-template-columns: 0 minmax(0, 1fr) !important;
}
/* Hide entire left sidebar */
#mw-panel,
.vector-sidebar,
.vector-column-start {
    display: none !important;
}

/* Let content use full width */
.mw-page-container,
.vector-page {
    margin-left: 0 !important;
    padding-left: 0 !important;
    grid-template-columns: 0 minmax(0, 1fr) !important;
}