Woocommerce Storefront Theme CSS White Text Issue

I’m using the Woocommerce Storefront Theme. I’ve changed the background to black and text to white. Now inside the shopping cart during Checkout, when filling out one’s address, the user needs to pull down to the U. S. they are in. The text is white and the background is white. I would like the text to be black in this area only. I’m assuming this is a CSS issue. How do I change this?