White Background Renders as Gray

Several people have posted about this issue, but I haven’t been able to find a solution yet in the forums. I am trying to make a plain white background in my scene. I have tried using both the skysphere and just a sphere in the scene. I have set them to a white material. It appears white in the editor and on playback it renders as gray.

Is there a way to create a simple white background in place of the default black background?

Thank you!!