Options are available in the Visual Studio configuration dialog box, such as the colors of various types of code-related issues. In the main IDE window, go to Tools | Options ... then Environment | Fonts and colors. In the "Show Positions:" list, you can find the "Dead Code" element. For this element, you can change the color properties of the Foreground Element and Background Background.
See here for more details: CodeRush Code Configuration and Parameter Issues
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