How to change the background color of an unselected checkbox in a dark theme?

What I’m trying to do:
I am trying to add a checkbox to a repeating panel in a data grid in the Rally (dark) theme.

What I’ve tried and what’s not working:
When selected, the checkbox is clearly visible, but when unselected it disappears into the background except when I am hovering on it. How can I use e.g. hover effect color as the unchecked default so the user can clearly see where the checkbox should be?

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