You can try this .ui.segment {background-color: ;}
Not sure if that's right though, there are so many divisions inside others and tables in some places that it can be tough figuring out which is making the background colour. That is a creamy colour, btw, you can change it to whatever colour you want :).
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Great! I find the white blinding too and have made many changes, but have to be careful that making one change doesn't inadvertently change things you don't want.
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