Color gradient when plotting graphs

[chim]

I would like to plot a bar graph with a color gradient where the longest bar has a dark color while the shorter bar has a lighter color.

From the SAS documentation, Objects have the Style option in Option Pane where I can set the Gradient which specifies the colors that make up the color gradient. Through changing the Gradient, am I able to achieve what I want to do?

Also, I am unable to find the Gradient in the Style of Option Pane. A screenshot is attached.

[Ksharp]

data county ;
	infile cards ;
	input county $ value id;
cards ;
CountyA	142 7
CountyB	65 6
CountyC	54 5
CountyD	43 4
CountyE	32 3
CountyF	21 2
CountyG	2  1
;
run ;
proc sgplot data=county noautolegend;
hbarparm category=county response=value /colorresponse=id
 colormodel=(lightgreen darkgreen) ;
run;