When using the event_plot command, my code is

Code:
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
Code:
default_look
is equivalent to:

Code:
 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
Array

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

Code:
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))
Array