How can I change the drop down menu color in my Etsy theme?

hi, i bought a theme on etsy and love it but am having issues with getting the drop menu on my listings to not be white, i want them black with white test. My theme is not published right now as im still working on it but here is the preview for it https://ghoulishneeds.com/?_ab=0&_fd=0&_sc=1 I did ask the person who made the theme and they are not sure how to change that.

What specific device, operating system and browser do you get white background for dropdown?

Make sure to clear the problematic devics browser cache and try again.

The menus appear with black backgrounds and white text on the lasted chrome browser on desktop

Same for feature product dropdown and on product pages:

you are looking at the live theme i have now not the preview theme. I gave the wrong link sorry here is the preview link - https://k1rcl3o1f5ekf29y-60540453116.shopifypreview.com

The navigation menu in this preview has no dropdowns.

The feature product dropdown menu ,

here is the preview for a phone case with drop menu to look at to see what im talking about.. ty for trying to help.. https://k1rcl3o1f5ekf29y-60540453116.shopifypreview.com

Also is there a way to do that for all drop down at one time instead of one at a time, it did work for the one i tried it on

It worked on all when i did it.. ty so much

Yes follow the manuals instructions to add it to the theme level setting not just a section.

Try the following CSS in the custom CSS theme feature (either for the theme for a section)> https://help.shopify.com/en/manual/online-store/themes/theme-structure/extend/add-css> > > .select__select, .customer select {> background: black;> }>