Want a pure white background for slides, but it looks slightly grey

Hey folks, I have a quick question and I can't seem to find an answer in the existing posts.

I have images I am using that have pure white background, and I am also using white boxes to stage in some content as my audio plays.

When I go to preview it, I can "see" the white, because the background looks just slightly grey.

I checked that my Design>Background Styles>Format Background is set for white fill with no transparency.

I looked at the player settings under the color/effects menu and chose the modern player with the dark player theme. I don't see any more options there.

Attached shows what my issue is. Any help is appreciated to get rid of the "white showing up" effect.

Thanks,
Coba.

 

 

 

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