Remove border of TWebPaintBox?

Is there a way to remove the black border that is drawn around a TWebPaintBox? 

At the moment I'm drawing a white rectangle to overwrite the black border. Is there a better way? I've tried various boostrap styles but haven't found one to remove the border. I notcied that in the generated hyml code that the black border might be hardcoded?

Ignore this question, it was my fault. I had a panel underneath which had a border. As a tip, if you're using boostrap, add border-0 to the body class name property of the panel to remove the border.