White background displaying grey

Hi All,

I am creating a resource where the colour of the background of the slide needs to be white.
I cannot get it to display white - as an example see this review - the white box in the middle has exactly the same RGB code (and HTML #FFFFFF) as the background, yet the background displays grey.

How do I get the background to display white please?


https://360.articulate.com/review/content/95604bed-0c51-4279-9b13-e8093acdf0a7/review


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