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url: https://docs.youcan.shop/changelog/theme-section-availability.md
---

You can choose the templates where a section is available, and add CSS with the `stylesheet` tag.

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# Section availability and stylesheet tag

* Use `enabled_on` or `disabled_on` in a section schema to choose the templates where the section can be added. See [`enabled_on` and `disabled_on`](/themes/sections/section-schema#enabled-on-and-disabled-on).
* With the [stylesheet](/themes/tags/stylesheet) tag, CSS is added to the page. The same CSS is added once per page.
* Inside a [liquid](/themes/tags/liquid) tag, a `comment` line, the matching `endcomment` line and every line between them are skipped.
* `templates/thankyou.json` and `templates/upsell.json` are optional. When they are missing from a theme, the customer sees the default pages. See [Required files](/themes/architecture#required-files).
* You can leave out `name` on an `@app` block.