MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Hide the entire sidebar (navigation, tools, search) */
#mw-panel {
  display: none;
}

/* Adjust main content to take full width */
#content {
  margin-left: 0 !important;
  width: 100% !important;
}

/* Adjust the header navigation */
#left-navigation {
  left: 0;
}

/* Hide the logo area too (optional) */
#p-logo {
  display: none;
}