When I click on https://beta.familysearch.org/wiki/pt/index.php?title=MediaWiki:Common.cs&action=edit, I do not see the coding in colors or the line numbers like in https://beta.familysearch.org/wiki/pt/index.php?title=MediaWiki:Common.js&action=edit and therefore can’t add CSS code to Portuguese Wiki.
Never mind. Danielle figured it out.