Novice here having trouble placing assets thanks in advance for any help

So i am trying to use this image as a background but i cant size it properly to fill a whole page and when i place a div block where i want it (moving it around relatively) then dropping in say a button. i align it where i want it but when i publish it has shifted. though using grid would help but im sure im missing something dumb. this is the only thing i am having problems with. all other elements seem to work well. but since i am building for all platforms i have to make scaling work across the board. can anyone help? here is my link https://preview.webflow.com/preview/aae-2020?utm_medium=preview_link&utm_source=designer&utm_content=aae-2020&preview=a7c98a611e5b80b1720a9d18004f9b30&mode=preview


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

Sounds like what you want is to use a background image. Backgrounds | Webflow University

If you are new to webflow I strongly suggest taking a pause on your build and spend quite a few hours on the university page to familiarize yourself with Webflow and web standards in general to help you with your build. Webflow 101 crash course | Webflow University

https://university.webflow.com/