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OP: suggest you look at sigil's find & replace facilities as you seem to be doing things the long way around at present.
there's no need to copy CSS stylesheet into/from another editing program because sigil has all the edit tools that you need, built-in
ALSO: re epub to mobi. you can work on your epub file within its calibre library location - so you don't have to re-import it to calibre before converting to mobi. You access the epub via open path or via calibre plug-ins ( which are also worth learning about)
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