Adding a state that updates a sticky add to cart button at the bottom of the page on mobile to checkout

Loom for reference - https://www.loom.com/share/d68532e865a143c5a28a28feb97a57d9?sid=40c8a240-eca3-4439-8afe-79b15b456108 Page for reference - https://johi.co/products/bond-repair-solution The sticky section will also have a cart icon that reads the values in the cart