Open Chocolate.xml file with a text editor like Notepad.
Search for:
<element id="Content[TrackDetail].Body.Lowlight" bg="231,209,182" fg="100,100,100" />
Replace it with:
<element id="Content[TrackDetail].Body.Lowlight" bg="151,114,84" fg="255,255,255" />
Save it and relaunch MB.