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Sticky add-to-cart

Keeps the buy box with the 'Add to cart' button visible while scrolling a long product page.

Code to copy

[data-box-name*="buy box" i],
aside:has(button[aria-label*="koszyka" i]),
div:has(> button[aria-label*="Dodaj do koszyka" i]) {
  position: sticky !important;
  top: 12px !important;
  z-index: 50 !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.