ADD MORE FUNCTIONALITY TO THE WEBSITE (NOT A WP)

Hello, Read all carefully. (!) Kindly send you portfolio, where you did a custom coding or a similar complex job (!) We have a website made from scratch. Need to have a plugin to be installed into the our website( it is not a wordpress site, it is made from scratch) . [login to view URL] - this is the feature (!) Remember - There will be two(2) of those features on our website. So you need to think how to build it properly. WHAT WE NEED: -(!) Kindly send you portfolio, where you did a custom coding or a similar complex job (!) - to customize and to properly implement this feature to the website. WHAT TO AVOID: we don't need to have only placing this feature. We need to customize it, so it turns like a real . We will provide a video of how we need it to the person we choose. FUNCTIONALITY: when you scroll down this feature turns smoothly like a real one. Not by clicking on arrows, but during a scrolling. DEVICES: has to work on mobile/desktop very well. No bugs. (!) Kindly send you portfolio, where you did a custom coding or a similar complex job (!)