How to colorize sidebar?

Hi,

I want to add my sidebar with background color..

I've read your previous discussion on http://forum.muffingroup.com/betheme/discussion/11127/sidebar-background, so i tried with this css.. But it's not working.

widget-area::before {
background-color: #000 !important;;
}

So i assumed that it need a background image.. So i make a plain background such this http://www.gds.or.id/id/wp-content/uploads/2016/03/image-1.png and try your css :

widget-area::before {
background-image: url('http://www.gds.or.id/id/wp-content/uploads/2016/03/image-1.png') !important;;
}

But it still not working.. Could you please help me to fix this?

Thanks