How to add a class to the body tag inside an Iframe

Hi there, I'm working on an old website that uses an embedded iframe, and I'd like to add some styling to it. The issue is that I have to add a class to the body tag that is nested inside the iframe tag but that part is not available in the frontend code. So what I did was to add the "hiring-room" class to the iframe, and then try to target the body with css like this: .hiring-room html body { my styling etc } but that doesn't work. How would you access this highlighted line? whether it is with DOM manipulation or any other way
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