Stylizing an Embedded Window

Has anyone ever tried to stylize the embedded window that displays a survey (when that option is chosen in the Advanced Options of an Intercept action)? If I choose that option the window has a very harsh and heavy black outline and my survey text is larger than it normally would be. I love the option of the embedded window (especially as we'll have to try and hide the URL for a separate issue), but it's very clunky looking:

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