How can I change the color of nested menus in Supply theme?

I am trying to change the background color of the nested menus but can’t seem to figure it out. Right now it is the same color as my background and when you click on the nested menu you can’t see it very well. I would like to change it to white so shoppers can actually read the options. Using Supply theme.

Hello,
Please share your site url and screenshot.
So that i can check and let you know the exact solution here.

klassykats.shop

Thank you!

Add this css at the bottom of
Online Store->Theme->Edit code->Assets->theme.scss.liquid

.site-nav--dropdown, .site-nav--dropdown-grandchild {
    background-color: white;
}

It worked! Thank you so much!!