Cell Format Dependant On Rows

I have


Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)

If Target.Cells.Count > 1 Then Exit Sub
If Not Intersect(Target, Range("A1:A10")) Is Nothing Then
With Target
Select Case .Value

Case "(None)": .Interior.ColorIndex = Null
Case "One": .Interior.ColorIndex = 38
Case "Two": .Interior.ColorIndex = 18
Case "Three": .Interior.ColorIndex = 35
Case Else: .Interior.ColorIndex = xlNone
End Select
End With
End If

End Sub

My problem is that columns A to H are yellow(36 I think) and are merged cells.
And Cells AW2 to BD2 are also yellow. The cells inbetween are white.

At the moment when the Cell value is "(None)" the cells turn white, I dont want this. I would like them to go to default.