Hey @Ahmedaraby 
Cool idea! Now I’m hooked to see what you’re building! Full disclosure, I haven’t built this sort of thing before, but if I needed to, I would start by checking out the Mouse and Keyboard interactions plugin we offer. It has some interesting actions for repositioning elements on the page through workflows.
You might be able to couple that plugin and it’s workflow actions with having this icon in a floating group or something so it can move dynamically as the user scrolls.
Anyways, best of luck with the build and definitely share an update with what you put together! If any additional questions come up, you’re always welcome to reach out to us directly at Support@Bubble.io