What might happening is the CSS is located at the head of each file that makes up the epub. You could look at each one and see if it is there, then maybe just eliminate it and make a link to a stylesheet where all the code you want is. In that case you will have use the existing style names and redefine them or knock them out of the body completely in each file and assign the styles you prefer to all the text.
If this came out of a browser, it might be easier to save as text so you don't pick up all this extraneous styling.
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