Themes are used to change the appearance of your Confluence site. See Working with Themes for an overview of how themes apply to your whole site, and how you can add more themes. Additional themes are currently only available for Confluence Server. They are not available in Confluence Cloud.To apply a theme across the site:
Go to
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> Themes.
The screen will display all available themes. Choose a theme.
Choose Confirm.
All spaces that have the Global look and feel applied as their space theme will inherit this theme and any customizations you make to it.