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On the Special:Undelete page in the MediaWiki core application, there are two buttons for preview and diff. These buttons do not have any space between them. They should be given HTML ids and CSS that creates some margin between them.

The code for this special page is at https://phabricator.wikimedia.org/source/mediawiki/browse/master/includes/specials/SpecialUndelete.php and the buttons are defined in showRevision on lines 473 to 486.

You are expected to provide a patch in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.