Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Not Intersect(Target, Range("B12:Z35")) Is Nothing Then
Range("A12:A35").Interior.Color = xlNone
End If
If Not Intersect(Target, Range("B12:Z12, B15:Z15, B17:Z17, B19:Z19, B21:Z21, B23:Z23, B25:Z25, B27:Z27, B29:Z29, B31:Z31, B33:Z33, B35:Z35")) Is Nothing Then
Range("A12:A35").Interior.Color = xlNone
Cells(Target.Row, 1).Interior.Color = 65535
End If
End Sub