Gadget export
To export the dark-mode gadget, click on "Pakua" button, save the downloaded file, go to Special:Import on the destination wiki and upload it. Then add the following to MediaWiki:Gadgets-definition page:
* dark-mode[ResourceLoader|supportsUrlLoad|targets=desktop,mobile|skins=vector,vector-2022,monobook,modern,minerva,timeless]|dark-mode.css
You must have appropriate permissions on the destination wiki (including the right to edit system messages) and import from file uploads must be enabled.