Sub test()
wsCount = Application.Sheets.Count
For i = 1 To wsCount
Sheets(i).Tab.ColorIndex = 6
lRow = Sheets(i).Range("A1").End(xlDown).Row
For j = 1 To lRow Step 2
With Sheets(i).Range("A" & j & ":AI" & j).Font
.Name = "Calibri"
.Size = 8
End With
Next
Next
End Sub