MediaWiki:Geshi.css

pre, .mw-code {
  color: black !important;
  background-color: #f9f9f9 !important;
  border: 1px solid #ddd !important;
  padding: 1em !important;
  white-space: pre-wrap !important;
  margin-top: 1em !important;
  margin-right: 0px !important;
  margin-bottom: 1em !important;
  margin-left: 0px !important;
    }