You need to add to the private stylesheet or edit the ReverseColor.nb
with
Cell[StyleData["InitializationCell"], Background->GrayLevel[0]]
because it was missed somehow. E.g. "Code" cell has this fixed already:
Cell[StyleData["Code"],
FontColor->GrayLevel[0.9],
Background->GrayLevel[0]
]
p.s. Built in stylesheets can be edited safely when moved from $InstallationDirectory
to appropriate directory in e.g $UserBaseDirectory
. An example: Package editor interface
To make the copied stylesheet file editable, open Option Inspector (Ctrl+Shift+O), make sure that the Show option values field says Selected Notebook, find Notebook options > File options > Editable and set it to True
.