Tag dropdown selected item - Th selection's background almost invisible - CSS

In my theme, a dark default one, I can’t tell which tag is highlighted in the tag selection drop-down. It took me a while to realize there was supposed to be a different coloured background there, it is so close to the colour of the background of the drop down.

Can anyone tell me what CSS ‘thing’ I need to modify the colour of to get the highlight to show up different?

I can’t seem to find what piece I need to modify in order to change that colour.

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