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How could I make perfectly solid color background

I had tried the way to use exponential height fog(fog height = 0, set up color) and post process volume and Directional light (uncheck Atmosphere Sun Light) and Atmospheric Fog(uncheck Use Attach Parent Bound)

but there was little gradiant

The result

How could I make perfectly solid color background

And I have already referred to “UE4 - Solid Color Background - YouTube” this video

The video describes a good way to do it. Why did it not work for you?

I followed exactly like that video too. However, when I ran it, there was a slight gradation as in the question picture.

Even with no lights, no skylight, no fog of any kind in the level?

I tried two ways
First. (The video version)

  1. Delete Sky sphere
  2. add exponential height fog → fog height to zero → background color set up
  3. Directional Light(Uncheck atmosphere sun light)
  4. add post process volume(ncheck Use Attach Parent Bound and set min, max brightness to 2)

Second. (without anything)

  1. All Delete
  2. add exponential height fog → fog height to zero → background color set up