Formatting the Embedded Widget with Own CSS

I love the flexibility of customizing the colors of the booking page / widget. It works perfect for embedding the widget into my appointment page. However, things start to hurt when clients proceed to booking.

My website is dark and purple and so is the widget. They click on the Book button and a bright white box pops out, looking so out of context. Is there a way to force my CSS code or file to format those pop-ups?

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Announcing: custom color palette + free workshop
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