What app is used for the 'sticky add to cart' feature?

[MatasMo]

Hello,

Maybe someone knows what "sticky add to cart" app is used in this website: https://doreandrose.com/en-eu/products/rochelunairepillowcase?variant=43679623282918

Website is built with theme "Pipeline"

Thank you for the answers!

[sakinur-rahman]

@MatasMoThey are not using any app. They have created it with raw coding, If you need like them, you may contact me. thanks