Override CSS in an encoded PHP Include

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I bought a script that is ioncube encoded. It's a file on my site that is called from a php include, but the text is HUGE, like 38px. Completely unacceptable. The vendor says there's no way to reduce this font size, it's coming from from CSS in the encoded file. Is there some kind of code I can wrap around the php include to override the style settings?Thanks for any help.