Styling the drop-down menus of the rich text editor

[ECH]

Is there a way to style the drop-down menu of the rich text editor? I have created a custom style, but see no way to modify this style property. Currently, the drop-down menu if very dark grey on black, making it very difficult to read. The drop-down menus on the menu bar are styled correctly. Any help anyone could provide is very much appreciated. Thank you.
Styling the drop-down menus of the rich text editor

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