You don't need to use those CSS settings anymore - go to Mobi input in the conversion settings and configure Calibre to ignore margins.
Regarding indent, that can vary slightly per book, there have been lots of threads on indents between Calibre and Sigil's forums the last few weeks. Search for other options, but a simple thing you can try in extra css would be this:
p {text-indent:3%}
Change 3% to whatever suits your taste.
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