Strange Gray Line

I am using the Rubik sub theme in a current project http://newsite.businessdayonline.com/ However, I noticed a strange line when a node is displayed and I have not been able to get rid of it. Inspecting with firebug or chrome dev tools have not helped at all since the line seems untraceable. I also made changes to the node.tpl, object.tpl, and form-default.tpl in the templates folder -removing the column-side and column-wrapper css classes because I suspected the line is attached to one of the containing div's. All of these have not removed the line as seen in the node here : http://newsite.businessdayonline.com/?q=edo-decides

Please what do I do to remove that line, it's driving me nuts. Thanks in advance.