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Themes allow you to define a particular 'look and feel' which can be applied across Confluence or to an individual space. Use themes if you want to add a new functionality or to significantly alter the appearance of Confluence.
To create a new theme,
1. Create the decorator files that define how the different content screens are laid out.
2. Create the colour scheme for the theme (optional).
Optionally, use a stylesheet which will override the styles defined in the decorator files.
3. Create the theme plugin module
4. Install the theme plugin
Working with decorators for themes
Overview
Content Tools
Apps