How to get rid the box in legends in proc sgplot

[Ananth_kumar]

proc sgplot data=trend_data noautolegend ;
styleattrs datacontrastcolors=(cx808080 cxc01933 cx003366);
title "&chart_title";
series x=Mo_Name y=Ctrl_MBR / group=Yr_nb lineattrs=(thickness=2) ;
xaxis label="Month" type=discrete labelattrs=(size=&_fontsizeh. family=&_fontfamily.) valueattrs=(size=&_fontsizeh. family=&_fontfamily.);
yaxis label="MBR_rate" labelattrs=(size=&_fontsizeh. family=&_fontfamily.) valueattrs=(size=&_fontsizeh. family=&_fontfamily. weight=bold);
keylegend / title="Years" position=bottom ;
run;
title;

[svh]

Add noborder to your legend statement.