//@version=4
study(title="BUY SELL", overlay=true, resolution="")
short = ema(close, 8)
long = ema(close, 21)
plot(short, color = color.red)
plot(long, color = color.green)
plotshape(crossover(short,long) , style = shape.triangleup , location = location.belowbar, color = color.green , size = size.normal)
plotshape(crossunder(short,long), style = shape.triangledown , location = location.abovebar, color = color.red , size = size.normal)