# Theme Customization An Otter Wiki was not designed with the idea that user-defined topics might become necessary. However, since there is a need, a way to modify the theme has been added. If you've made improvements that you'd like to share, don't forget, pull requests are always welcome. Or upon up an [issue](https://github.com/redimp/otterwiki/issues) post your code and a screenshot. Check [otterwiki/docs/custom_css_example](https://github.com/redimp/otterwiki/tree/main/docs/custom_css_example) on github for ready-to-test examples. ## `custom.css` With version **2.3.1** the template loads a `custom.css` and a `custom.js` which are empty by default. You can mount the directories into the container, for example with a `docker-compose.yaml` like this: ```yaml version: '3' services: otterwiki: image: redimp/otterwiki:2 restart: unless-stopped ports: - 8080:80 volumes: - ./app-data:/app-data # a custom local directory with a custom.css and a custom.js - ./custom:/app/otterwiki/static/custom ``` ## Examples ### Serif Pages This is an example custom.css that uses the serif font `Baskervville` for the content rendered in the page. ```css @import url('https://fonts.googleapis.com/css2?family=Baskervville'); .content > .page { font-family: 'Baskervville', serif; font-weight: 400; } ``` ![](/Customization/a/baskervville-page.png)