Congo ships with a few colour schemes out of the box. To change the basic colour scheme, you can set the `colorScheme` theme parameter to one of the default configurations. Valid options are `congo` (the default), `avocado`, `fire` and `ocean`.
In addition to the default scheme, you can also create your own and restyle the entire website to your liking. Schemes are created by by placing a `<scheme-name>.css` file in the `assets/css/schemes/` folder. Once the file is created, simply refer to it by name in the theme configuration.
Congo defines a three-colour palette that is used throughout the theme. The three colours are defined as `neutral`, `primary` and `secondary` variants, each containing ten shades of colour.
Use one of the existing theme stylesheets as a template. You are free to define your own colours, but for some inspiration, check out the official [Tailwind colour palette reference](https://tailwindcss.com/docs/customizing-colors#color-palette-reference).
## Overriding the stylesheet
Sometimes you need to add a custom style to style your own HTML elements. Congo provides for this scenario by allowing you to overrid the default styles in your own CSS stylesheet. Simply create a `custom.css` file in your project's `static/css/` folder.
The `custom.css` file will be loaded automatically after all the other theme styles which means anything in your custom file will take precedence over the defaults.
## Building from source
If you'd like to make a major change, you can take advantage of Tailwind CSS's JIT compiler and rebuild the entire theme CSS from scratch.
**Note:** Building the theme manually is intended for advanced users.
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Change into the `themes/congo/` folder and install the project dependencies.
```bash
npm install
```
Once installed, you can edit the `themes/congo/tailwind.config.js` to change the styles that are applied throughout the theme. You can also adjust specific styles in `themes/congo/assets/css/main.css`.
To allow for easy theme colour changes, Congo defines a three-colour palette that is used throughout the theme. The three colours are defined as `neutral`, `primary` and `secondary` variants, each containing ten shades of colour. In order to change the colour across the entire theme, simply edit the `tailwind.config.js` file accordingly.
For a full list of colours available, and their corresponding configuration values, see the official [Tailwind docs](https://tailwindcss.com/docs/customizing-colors#color-palette-reference).
After editing the configuration, you need to rebuild the theme's stylesheets.
```bash
npm run build
```
This will automatically output a minified CSS file to `/themes/congo/static/css/main.css`.
To aid with testing style changes, you can also run the Tailwind JIT comiler in watch mode.
```bash
npm run dev
```
Now whenever you make a change, the (non-minified) CSS files will be rebuilt automatically. This mode is useful to run when using `hugo server` to preview your site during development. Remember to perform a full build before publishing your website.
