How to keep Ant Design Dropdown component background color same even when clicked (React, CSS)

So I'm using the following Antd component:

And it has some behavior that I am trying to override. I want a dropdown with a white background. And the background is white at first:

However, when I click the dropdown and move my cursor off of it, the background turns transparent:

I've tried many CSS tricks, but none of them keep the background the same after clicking, and I need that.