This plugin uses CSS to style the header of the Gerrit UI for the Gerrit server of the Eclipse Foundation.
This plugin is based on the polyCssStyle example plugin.
Copy the file gerrit-eclipsestyle.html into the Gerrit site's plugins directory. There is no need to restart, once the file was copied, Gerrit will detect the new PolyGerrit plugin after a few moments and will use it.
https://git.eclipse.org/r/admin/repos/git.eclipse.org/gerrit-eclipsetheme