> For the complete documentation index, see [llms.txt](https://insights.gitbook.io/ecomm-doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://insights.gitbook.io/ecomm-doc/customize/additional-css.md).

# Additional CSS

### Themes > Customize > Additional CSS

Where to add CSS code to customize the appearance and layout of your site