Hi, I want to add a product page navigation menu to my shop. Here is a demo of such navigation bar in someone else’s store: https://www.flextail.com/products/max-boat-pump
On that page, there is a navigation bar that sticks around. There are links to: Description, Specification, Review. It would scroll down smoothly as you click one of them and it sticks to the top so you can go back quickly. I find it very elegant but I have no idea how this could be done. Is this a theme specific feature or is it an app? Or can I add some code to my existing theme? It would be wonderful if someone can give me some guidance. Thank you so much in advance!