# Header

- [Announcement bar](https://help.fluorescent.co/cornerstone/header/announcement-bar.md): Learn how to set up the announcement bar to display special promotions, an information popup, country and language selector, and social media icon links.
- [Header](https://help.fluorescent.co/cornerstone/header/header.md): Learn how to set up the Header in the Cornerstone theme for Shopify, with custom layouts, logos, transparent headers, and mega navigation menus. Watch the video for navigation menus for large catalogs
- [Logo](https://help.fluorescent.co/cornerstone/header/header/logo.md)
- [Layout and style](https://help.fluorescent.co/cornerstone/header/header/layout.md)
- [Mega navigation](https://help.fluorescent.co/cornerstone/header/header/mega-navigation.md)
- [Transparent header](https://help.fluorescent.co/cornerstone/header/header/transparent-header.md)
- [Mobile menu](https://help.fluorescent.co/cornerstone/header/mobile-menu.md): Learn how to customize the mobile menu drawer in the Cornerstone theme for Shopify. Set up a mobile logo, navigation menus, featured links, and featured blocks for promoted collections and products.
- [Search bar](https://help.fluorescent.co/cornerstone/header/search-bar.md)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.fluorescent.co/cornerstone/header.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.