local monitor = peripheral.find("monitor")

function drawText(x, y, text, color)
    monitor.setCursorPos(x, y)
    if color then
        monitor.setBackgroundColor(color)
    end
    monitor.write(text)
end

monitor.setBackgroundColor(colors.black)
monitor.clear()

local loading = 0

while true do
    drawText(20, 13, "Loading...")
    for x = 1, loading do
        drawText(15 + x, 15, " ", colors.white)
    end
    loading = loading + 1
    if loading > 21 then
        loading = 0
    end
    os.sleep(0.8)
end