Fixing couple issues

I am trying to change the color of the cart icon to white in normal view but black in mobile view. How do I do that? Additionally, when I place an item in the cart and hover over the buttons ‘view cart’ and ‘checkout’, the hover color is completely black, how do I change the hover colors for that as well. And for some reason, on the menu, when the hover over ‘store’, the submenu background is transparent. How do I change that back to normal background color?

The page I need help with: [log in to see the link]