Iframe CSS Changes HubSpot

I have debugged the code and apply to our changes but due to content comes from external source in iframe , our changes not reflecting
So we need HubSpot account details to add inline CSS to the form.
Thanks!
Correct above

Here is the corrected and more polished version of your message:

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I have debugged the code and applied our changes, but since the content is coming from an external source within an iframe, our changes are not reflecting. Therefore, we need access to the HubSpot account to add inline CSS directly to the form.

Thank you!

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Let me know if you want a more formal or casual tone.