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The short answer is probably: "No".
The default css of Sigil will be somewhere in either its source code or in the code of its components. In the first case you could get the code and go through it looking for it, but I think it is more likely that the css of the web browser component is used.
The other problem with your question might be, that you seem to assume things.
It sounds like you expect the default css of Sigil to have an effect on how your ebook will look in the target software. I don't think that is correct.
Each and every software displaying ebooks will have its own default css, that is used to style elements that do not have an explicit styling.
If you want to have standard elements in your books look the same on different devices, you have to define the style for those elements yourself.
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