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

# Custom CSS

Add custom styles to your entire online store.

[Learn more](https://help.shopify.com/en/manual/online-store/themes/theme-structure/extend/add-css)