Note that as of RSS Guard `4.1.3`, old skins `vergilius` and `dark` were removed and replaced with `nudus-*` skins. For now, only `nudus` skins are maintained by RSS Guard developers.
Creating a custom UI is possible with `skins`. Each skin should be placed in its own root folder and must contain specific files. The [built-in skins](https://github.com/martinrotter/rssguard/tree/master/resources/skins) are stored in folder together with RSS Guard executable, but you can place your own custom skins in a `skins` subfolder in [user data](userdata) folder. Create the folder manually, if it does not exist.
*`html_*.html` - HTML files which are dynamically put together to create a complete HTML pages for various things, like newspaper view, article viewer, or error page
Note that not all skins have to provide a full-blown theming for every UI component of RSS Guard. Skin can provide just a custom HTML/CSS setup for article viewer and a minimal Qt CSS styling for UI controls.
Skins usually define custom palette of colors which is yet another mechanism to change look of RSS Guard. This skin subfeature is enabled with `Use skin colors` checkbox on `Settings -> User interface` dialog section.
Also, user can define custom CSS styles independently in file `<user-data-folder>/web/user-styles.css`. The file would be then loaded by RSS Guard and its styles applied to internal web browser.