Hi @Alex_Hartan, in the context of the designer and fixed positioning, the Body IS the viewport.
When you apply a position fixed, it is always positioned to the Body, that is standard, normal behavior for fixed position elements.
The Sticky feature in Webflow allows you fix an item while it’s parent element is scrolling and then reverts back to static, absolute or relative depending how the element is styled initially.
Learn more about the Sticky feature if you want to have fixed position elements only while a certain section or element is visible: https://webflow.com/feature/position-sticky
If you position an element as absolute, it will be positioned absolutely to the first parent element having a relative position, or if no parent element having a relative position, the element will be absolute to the Body (the viewport).
I hope this helps.