> For the complete documentation index, see [llms.txt](https://docs.shopone.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.shopone.io/english/basic-setup-tools-for-the-landing-page/quick-setup-bar/design-editor/id-css.md).

# ID CSS

**ID CSS** is a way to apply specific CSS styles to a single element in an HTML document. Each ID in an HTML page must be unique, meaning that only one element can have a particular ID.

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