Please Help with CSS Hack

Can you please help me change the form label input color from white to black on this page? https://monikamundell.com/3-payments/

Right now the labels come up with white font, so they’re hard to read. I’d like to change those to black, but don’t know the CSS string I need to put into my custom.css file.

So far I have managed to do this to make the background turquoise. What am I missing to change the label input text to black?

.page-id-386 { background: #0FDDAF url(#) repeat top left; }

Would appreciate the exact code please. Thanks so much for your help.

Nika