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## Themes

A theme is nothing more than a stylesheet that defines design tokens and applies custom styles to components. To create a theme, you will need a decent understanding of CSS, including CSS Custom Properties and the ::part selector.

### All themes are scoped to classes using the `data-theme` attribute convention, where the value is a lowercase, hyphen-delimited value representing the name of the theme. The included light and dark themes use light and dark, respectively. A custom theme called "Purple Power", for example, would use a class called sl-theme-purple-power. 

This data attribute can be placed in any parent ancestor on a page, for example, on a `sc-form` element apply a theme style everything inside the form.

### Developing a Theme

To develop a theme, we utilize [StoryBook](https://storybook.js.org/) to lay out all the components and apply theme styles. You should find a file called `themes.stories.ts` in the root of the components directory.

This story will allow you to see all available components on a page so you can add css for your theme style to change the look of the components.

### Running The Storybook Command

To start the development process, please run this command (in the packages/components directory)

```
yarn watch & yarn storybook
```

This will open up storybook in a new browser window and hot-reload any changes.
