Private Sub Worksheet_Change(ByVal Target As Range)
Dim ligne As Byte, colonne As Byte
Application.EnableEvents = False
With ActiveSheet
Fin = .Range("L" & .Rows.Count).End(xlUp).Row
If Not Application.Intersect(Target, Range("M2:M" & Fin)) Is Nothing Then
If Target.Offset(0, 1) = "" Then
Target.Offset(0, -1).Font.ColorIndex = 4
End If
End If
End With
Application.EnableEvents = True
End Sub