Sticky add-to-cart
A slim buy bar that slides into view once the shopper scrolls past the main buy area, and stays pinned. It carries a product thumbnail, the price, an optional variant and quantity picker, and the Add to Cart button. It can sit within the page width, stretch across the full browser width, or float as an overlay.

How to turn it on
In the theme editor, open the product template → Product information section → Product details block.
Add the Sticky add to cart block inside it, or inside a Group within it.
Choose a Layout style.
Turn Show variant selector and Show quantity selector on or off.
Adjust the thumbnail width and button height to suit your product page.
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