simple fog

Hi, I cant find ultra simple fog material in internet wtf, I just need deepth fade fog but also full cube, I mean if I use deepth fade look great outside but when I move camera inside cube is empty. Can you help with this? I dont wanna use volume material becouse this fog moving when i move camera and sry for my bad language

Do you need something like this?

thx but its volumetric and I dont want using this metod

Here you go. These settings are incredibly light so please do change the params. To apply, use as post process material, and put it in your PPV

Thnak you so much for this!