-- declare and set up the monitor
local attachedMonitor = peripheral.wrap("left")
attachedMonitor.setBackgroundColor(colors.black)
attachedMonitor.setTextColor(colors.white)
attachedMonitor.setTextScale(.5)
attachedMonitor.clear()

-- show the button
attachedMonitor.setBackgroundColor(colors.blue)
attachedMonitor.setCursorPos(3,2)
attachedMonitor.write(string.rep(" ",10)) -- 10 spaces

--Display the label
attachedMonitor.setTextColor (colors.white)
attachedMonitor.setCursorPos(3+2,2) -- remember 2 columns more for centering here
attachedMonitor.write("Button")

-- reset to original text/background colors
attachedMonitor.setBackgroundColor(colors.black)
attachedMonitor.setTextColor(colors.white)