Fill Background Color for Fields on Form

In the CSS Styler I am able to change the background color on the button but it appears I cannot do it for the fields themselves. I do not want a background on the entire form itself because it is flowing horizontally on one line and want it appear naturally over the slider revolution background layer.

If I am able to change the fill color to the fields to white and the field txt color to a dark grey that would be ideal.

Can I receive some assistance with this?

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