// Credit to @kerberos007.
//@version=5
indicator("%B", shorttitle="%B", overlay=false)

moving_average = input.int(20, minval=1, title="Moving Average")
std_dev = input(2.0, title="Standard Deviations")
symbol = input("VIX", title="Symbol")

current_close = request.security(symbol, timeframe.period, close)

[basis, upper_band, lower_band] = ta.bb(current_close, moving_average, std_dev)

percentB = (current_close - lower_band) / (upper_band - lower_band)

plot(percentB, title="%B", color=color.yellow)

hline(0, "Lower Band", color=color.red, linestyle=hline.style_solid)
hline(0.5, "Middle Band", color=color.gray, linestyle=hline.style_solid)
hline(1, "Upper Band", color=color.lime, linestyle=hline.style_solid)