Bonus Gift Integration for Sale Site

I want to refresh my current sale page so every shopper instantly sees—and can claim—a bonus gift that comes with qualifying purchases. The core site is already live; what’s missing is a well-designed, smoothly functioning bonus-gift section that feels native to the existing layout, shows the gift during checkout, and triggers automatically when the cart meets the threshold I set.

You will:
• Add a dedicated bonus-gift banner and call-out on the main sale page, styled to match the current look and feel.
• Build the logic that adds the gift to the cart (or reveals a unique discount code, depending on what tests best) without disrupting existing checkout flow.
• Make sure the offer is responsive, loads fast, and works across modern browsers and mobile.
• Supply the updated files or push the changes through my CMS/Git repository with clear comments so I can tweak copy or swap gifts in the future.

Acceptance criteria
1. Gift (or code) appears automatically once the cart meets my preset condition.
2. No conflicts with existing promotions, taxes, or shipping rules.
3. Layout remains pixel-perfect on desktop, tablet, and phone.
4. All edits are clearly documented.

If you routinely work in HTML/CSS, JavaScript, and popular e-commerce platforms (Shopify, WooCommerce, or similar), this should be straightforward. Please include a link to one live store where you’ve implemented a comparable incentive, and note any preferred tech stacks or plugins so we can move quickly.