Layer not rendering correctly at all, completely white.

I’ve made this in blender and I’ve been trying to get an afternoon atmosphere that looks nice.
I can’t do this when the layer in the background turns a bright white no matter what I do despite the sun and the plane being on completely seperate layers.

Can somebody help me with this?

Here’s the .blend file.

For the background layer you should connect the Image output to the Alpha Over node, not the Alpha. The Alpha is a black and white output



Thank you so much. I’ve been messing with this for hours.