How can I change the background color for an "In Focus" folder or file?

Is it possible to fine-tune a Lister theme (e.g. vs dark) so that the folder that is "in focus" is highlighted with a different background color? I am seeking to change both the background and the text color, for both the tree folder node and for the folder or file I click in a list. (the dark blue background is hard for me to see).
dopus-focus-colors

Additional Information:
I did see the Focus Color post, and this worked for in focus file and folder, but not for the in focus tree node (folder). For the folder tree, I found the settings in a separate area.
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For files and folders, check "Selected Background" on right:

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