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How to change the scrollbar's color of the content area?

Please open "/js/kose.js" file and find this code:

$('#inner-content-container').niceScroll({
			cursorcolor : '#fcda1c',
			cursorwidth : 3,
			cursorborder : 0,
			touchbehavior : false,
			autohidemode : true,
			hidecursordelay : 1000,
			scrollspeed : 100,
			//bouncescroll : true,
		});

Just change the color code for "cursorcolor" option here. 

The template uses "NiceScroll" JS for the scrollbar. For more info about the JS, see here: http://areaaperta.com/nicescroll/