Conditional Formation More Then 3 Conditions VBA

I have some data in cells C5:G50

I can then enter some data in cells C4, D4, E4, F4, G4

What i want now to happen is when the value in C4 matches a value
anywhere in C5:G50 then i want that cell to have green background etc.

I have found this code but it does not seem to work


Private Sub Worksheet_Change(ByVal Target As Range)
Dim icolor As Integer
Dim c As Range

If Not Intersect(Target, Range("C5:G50")) Is Nothing Then
For Each c In Intersect(Target, Range("C5:G50"))
Select Case c
Case Is = "C4"
icolor = 5
Case Is = "D4"
icolor = 5
Case Is = "E4"
icolor = 5
Case Is = "F4"
icolor = 5
Case Is = "G4"
icolor = 5
Case Else
icolor = xlNone
End Select
Intersect(Rows(c.Row), Range("C:C,D:D,E:E,F:F,G:G")).Interior.ColorIndex = icolor
Next c
End If
End Sub