monitor = peripheral.wrap("back")

while true do
 monitor.clear()
 monitor.setTextColour(colors.white)
 w,h=monitor.getSize()
 monitor.setTextScale(2)

monitor.setCursorPos(math.ceil((w / 2) - (#"Want to see your ad here?" / 2)), 3)
monitor.write("Want to see your ad here?")

monitor.setTextColour(colors.yellow)
monitor.setCursorPos(math.ceil((w / 2) - (#"Contact the staff for info!" / 2)), 4)
monitor.write("Contact the staff for info!")

os.sleep(10)
end