> For the complete documentation index, see [llms.txt](https://modular.presidiocreative.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://modular.presidiocreative.com/theme-settings/theme-settings/custom-css.md).

# Custom CSS

Custom CSS is a new block added by Shopify for all themes. Use it to add your own CSS without the need to access the theme code.

<figure><img src="/files/Gzpqgun2IVEEgOLUa2Gs" alt=""><figcaption></figcaption></figure>