Currrency switcher color dropdown item

-- url of the page with the problem -- : nieuw.megiq.com/shop/vector-network-analyzers/vna-0440

At the top of page nieuw.megiq.com/shop/vector-network-analyzers/vna-0440 you will see the currency switcher. I already changed the color of the euro to white. But how can I also change the color of the little dropdown to white?
See printscreen.

Hi,

It's possible with such CSS:

I tried, but it does not work...Can you check again?

Hi,

I don't see the CSS I gave you on your page. And I tested it on your page before giving it to you with the inspector tool on my browser so I'm positive it will work.
I can only think that you didn't add it properly on your website.