postEdit notification[1] is not centered evenly because of transform: translateX( 35px );[2]
1: https://gerrit.wikimedia.org/g/mediawiki/core/+/e9a1a43f6feff6823b5daf6b13340e792845cc94/resources/src/mediawiki.action/mediawiki.action.view.postEdit.js#27
2: https://gerrit.wikimedia.org/g/mediawiki/core/+/b73225d2f5f60398403e948ad3812292fd4278ee/resources/src/mediawiki.notification/default.css#31