100% body height Div is not stretching whole body

Hi I am trying to fit a background image to a website i am building right now. The background image is quite high and i want it to stretch the whole body height in any window width. I thought to myself that it will be easy, but it seems like there is some kind of bug or something that i am missing. because when i set the div to be 100% height it sets to 100vh instead of the whole body.

On my body i have set 100% height, this div - (BG image container) has also set 100% value but it spans just across my screen window not body.

thanks for any advice.

Here is my site Read-Only: Webflow - Zootify

Anyone? need to fix it asap