Pine Script Highlight POC

//@version=6
indicator("Highlight POC", overlay=true)

var box signalBox = na

if ta.crossover(close, ta.sma(close, 20))
    signalBox := box.new(
        left = bar_index,
        top = high * 1.01,
        right = bar_index + 6,
        bottom = low * 0.99,
        bgcolor = color.new(color.green, 80),
        border_color = color.green
    )

if not na(signalBox)
    box.set_border_width(signalBox, close > ta.sma(close, 20) ? 4 : 1)
    box.set_border_color(signalBox, color.new(color.green, 20))