This guide describes how to download viewport themes as a JAR file, and how to install one of these JAR files to your Confluence system.
Download a theme as a JAR file
To save a theme as a JAR file, navigate to the theme management screen at Confluence Administration > Scroll Viewport > Themes, and then click Download for the relevant theme.
Install a theme in JAR format
You can install these JAR files like this on the Confluence add-on management screen at Confluence Administration > Manage add-ons > Upload add-on.
After you have selected the theme you want to install, and installed it, the theme will be available in all spaces.