Hello @QNTNJHL,
According to this post: DOCX to JATS XML converter - #28 by Vitaliy - there is a file within the eLens Plugin that you can modify the CSS style - lens.css. You should be able to make you’re modifications there. You’ll want to track your modifications if you upgrade to the plugin, though, as that might overwrite them with a new version of the file.
Best regards,
Roger
PKP