Themes set the base styling for a Scrolly article, such as font style and size. [themes.js](https://github.com/Financial-Times/n-scrollytelling/blob/main/components/image/server/utils/themes.js) contains the Themes object.
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**Sans**

Description: This theme is about conveying information to the reader. The words should explain the visual (or an aspect of the visual) being scrolled over. <br>
Input: `theme="1"` <br>
Output: `class="n-scrollytelling--theme-sans"`, `data-scrollytelling-theme="sans"` <br>
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**Serif**

Description: This theme is about creating a narrative, atmosphere, or mood - the words will speak to the visual being scrolled over. <br>
Input: `theme="2"` <br>
Output: `class="n-scrollytelling--theme-serif"`, `data-scrollytelling-theme="serif"` <br>
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