Line between sidebar and contentbox

HTML & CSS
1

Hello guys. I want to add the black line between sidebar and contentbox to make them separated on my website: cube-field.com
What the css code I need to use to solve this problem? The name of the theme is U-design.
Thanks.

2

On the external stylesheet, add the blue property to this selector.


#main-content .main-content-padding {
    [color=blue]border-right: 1px solid #000000;[/color]
}