How to change black background of options in dropdown menu?

I have a form where the dropdown menu options are black in the background and the font is black as well how can I change the black background so the font can be seen

Please insert this custom CSS code in your form:

option {
background-color : #ffffff !important;
}

Here's a guide on How-to-Inject-Custom-CSS-Codes.

Hope that helps. Thank you.