How to ensure the Shopify shopping cart is displayed on all pages of my Webflow site after integrating the "ADD TO CART" button?

TL;DR

Add the full Shopify cart script to Webflow’s global Footer Code via Project Settings to ensure it's loaded on all pages.
Alternatively, embed the script in a reusable Webflow Symbol added to every page to maintain persistent cart functionality.

To ensure the Shopify shopping cart is displayed on all pages of your Webflow site after embedding the "Add to Cart" button, you need to integrate Shopify’s cart script consistently across your site.

1. Include Shopify Cart Script on All Pages

Shopify’s Buy Button integration uses an external JavaScript SDK that enables the cart.
Copy the embed code (from Shopify) that includes the shopify-buy-button.js script and the associated cart and product components.
Insert this entire embed snippet into Webflow's global custom code by going to Project Settings > Custom Code > Footer Code.

2. Avoid Page-Specific Embeds

If you’ve only pasted the cart script on specific pages, it won’t persist site-wide.
Ensure that the cart embed (including the container and initialization code) is placed in either the Footer of the entire site or in a Symbol that’s reused on all pages.

3. Use Webflow Symbols for Reusable Cart UI

Create a Webflow Symbol (such as a fixed header or floating cart icon) and embed the Shopify cart code inside an Embed element within that Symbol.
Add the Symbol to all pages so that the cart script initializes regardless of which page the user is on.

4. Test the Cart Overlay

Shopify's cart opens as an overlay (side panel or popup), so make sure:
You’re not hiding the cart button container via CSS.
There are no conflicting JavaScript errors on your pages that prevent the cart from initializing.

5. Verify Button and Cart Work Across Pages

Visit multiple pages on your live Webflow site and add items to the cart.
Confirm that the cart icon, item count, and checkout functions persist and update without errors.

Summary

To make the Shopify cart persistent across all pages on your Webflow site, add the full cart script to your site's global footer code or use a reusable Symbol containing the full embed. This ensures Shopify’s cart UI initializes correctly no matter which page the visitor is on.

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