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My volume scatter 'fog box'/cube has a hard edge that I would like to soften. Is than an easy way to do that? I am trying multiple 'fog boxes' with decreasing density but am wondering if I could do anything here with GN. I also tried subdividing my cube and altering the shape to be less flat at the top but that seems to be a bit too fiddly.

Too sharp, want this transition to be softer, to fade out more enter image description here

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I usually use a Gradient Texture, separated on the Z-axis to soften the falloff. The Invert Node is not necessary (you can invert with the ColorRamp instead), I just put it there to make it more clear what's happening. I usually like to warp the vectors of the gradient with a Noise Texture first, to give a more natural look:

FogWarp

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