How to adjust the colour of event plot ?

[Phuc Nguyen]

When using the event_plot command, my code is

event_plot, alpha(0.01) default_look graph_opt(xtitle("Periods since the event") ytitle("Average causal effect") ///
    title("Random title") xlabel(-12(4)24))

Where

default_look

is equivalent to:

 graph_opt(xline(0, lcolor(gs8) lpattern(dash)) yline(0, lcolor(gs8)) graphregion(color(white)) bgcolor(white) ylabel(, angle(horizontal))) lag_opt(color(navy))
            lead_opt(color(maroon) msymbol(S)) lag_ci_opt(color(navy%45 navy%45)) lead_ci_opt(color(maroon%45 maroon%45)) legend_opt(region(lstyle(none)))

I got the graph as below

What I want is to change the graph to black and white colours only, with the confident interval before zero and after zero are in different types to distinguish them.
Thank you in advance.

I have tried to merge the code together but it has failed so far

event_plot, alpha(0.01)   graph_opt(xline(0, lcolor(gs8) lpattern(dash)) yline(0, lcolor(gs8)) graphregion(color(white)) bgcolor(white) ylabel(, angle(horizontal))) lag_opt(color(navy))
            lead_opt(color(maroon) msymbol(S)) lag_ci_opt(color(navy%45 navy%45)) lead_ci_opt(color(maroon%45 maroon%45)) legend_opt(region(lstyle(none))) graph_opt(xtitle("Periods since the event") ytitle("Average causal effect") ///
    title("Random title") xlabel(-12(4)24))