//@version=6
indicator("Paste Check", overlay = true)

fastLen = input.int(9, "Fast EMA")
slowLen = input.int(21, "Slow EMA")

fast = ta.ema(close, fastLen)
slow = ta.ema(close, slowLen)

plot(fast, "Fast", color = color.teal, linewidth = 2)
plot(slow, "Slow", color = color.orange, linewidth = 2)

bullCross = ta.crossover(fast, slow)
bearCross = ta.crossunder(fast, slow)

var int trend = 0
if bullCross
    trend := 1
else if bearCross
    trend := -1

bullBg = color.new(color.green, 88)
bearBg = color.new(color.red, 88)
bgcolor(trend == 1 ? bullBg : trend == -1 ? bearBg : na)
plotshape(bullCross, "Buy", shape.triangleup, location.belowbar, color.green)
plotshape(bearCross, "Sell", shape.triangledown, location.abovebar, color.red)