How to add custom CSS with iframe implementation?

I want to customize my KapChat chat box styling. But, since I prefer using a single browser source in my scenes, I am attempting to add the chat box widget via an iframe, like this:
<iframe id='chatbox' src='' frameborder='0' width='392' height='640'></iframe>

However, as far as I can tell, there is no documented way to add CSS like this, and I can’t inject html into the iframe directly. Is there a way?

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