Streaming live at 10am (PST)

Floating fixed object while scrolling

I would like to create product page with fixed (floating) object on the right side of the page, so all important info and buttons are always easily accessible and visible on screen.

Can anyone help me with instructions?

Example:
Airbnb product page, right info cloud is floating fixed while scrolling down the page
https://www.airbnb.si/rooms/21236342?location=Oregon&source_impression_id=p3_1579875324_QZQwFCrOrpqTsoKF


Here is my site Read-Only: LINK
(how to share your site Read-Only link)