Checkout Credit Card Text Color

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I currently have my checkout main content area background set to black with form fields set to transparent:

Screen Shot 2021-06-26 at 12.37.09 PM.png

I can't seem to figure out how to get the text in the form input fields to be white. 

Screen Shot 2021-06-26 at 12.38.00 PM.png

 The text in the input fields is currently showing up black. 

On further inspection I see that these fields are loaded via iframe and have a separate CSS file loaded

Can someone provide some guidance on where i would go to set the text color for the input fields to white (#FFFFFF).

I am using the default Debut theme.