ppo death or golden cross

//@version=3
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study(title="PPO Death/Golden Cross", precision=1)

use250 = input(false, type=bool, title="Use 50vs250 SMA?(50vs200)")
showhist = input(false, type=bool, title="Show Histogram?")
showxo = input(false, type=bool, title="Show crossings?")
offset = 0.9
sigma = 6

price = close

short = sma(price, 50)
long = use250 ? sma(price, 250) : sma(price, 200)
osc_line = short - long
osc = 100 * (short - long) / long
osc_hist = osc - 0

forestgreen = #228B22
crimson = #DC143C
darkorange = #FF8C00

belowsignal = osc <= 10
ppocolorh = belowsignal and osc_hist >= osc_hist[1] ? maroon : belowsignal and osc_hist < osc_hist[1] ? crimson : osc_hist < osc_hist[1] ? forestgreen : lime
osc_color = belowsignal ? crimson : osc <= 10 ? orange : forestgreen
crossing_u = crossover(osc, 0)
crossing_d = crossunder(osc, 0)

plot(showhist ? osc_hist : na, color=ppocolorh, style=histogram, linewidth=4, transp=0, editable=true, title="Histogram", trackprice=true)
hline(0, 'Zero', linestyle=dashed, linewidth=1, color=#7B68EE, editable=false)
plot(osc, color=osc_color, linewidth=2, transp=0, style=line, editable=true, title="PPO")

plotshape(showxo ? crossing_u : na, title="Dot mark Up", style=shape.arrowup, location=location.top, color=forestgreen, transp=0, size=size.small, editable=false)
plotshape(showxo ? crossing_d : na, title="Dot mark Down", style=shape.arrowdown, location=location.bottom, color=crimson, transp=0, size=size.small, editable=false)