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DeNesting the css is probably for the best if you want your epub to work on a large number of readers. The support for nesting css is quite new and therefore it is not supported by many e-readers. Plus there are many problems using nested css especially when the nesting gets more than 2 levels deep.
It is for this reason, Sigil has a built-in denesting code in recent versions. Enter it in nested form then use css reformat to unnest it for more general consumption. Ease of entry for you. Nicely denested normal css code that will work almost everywhere for e-readers.
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