cmd.exe highlight background color

The Popup Background settings from the Console Windows Properties is for the the color of the console popup window such as when you press F7 to view the history of commands you've used in your console session.

By default the console screen highlight color simply appears to be the inverse color of whatever color you have set in the Console Windows Properties from the Screen Background setting.

Therefore as suggested, if you set the Screen Background colors to 50,50,50 in the Selected Color Values settings, then this seems to give you a gray highlight color per its inverse color.

The trade off for doing this is that the regular of non-highlighted console background color will be of a lighter shade than just solid black.

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Further Resources

• Consider adjusting the color, contrast and/or brightness settings of your monitor rather than the Console Windows Properties to get you a desired result of color shades, etc. too.
• Introducing the Windows Console Colortool