My widgets are all showing up as blank white rows

As title says. I’ve only just started using this (free - syndey) theme and when I add my rows and widgets in page builder they show up as a blank white strip. Can be seen here www.cledsshed.com on the fornt page.

Not sure of the problem, many thanks for any help.

Hello,

Did you check Sydney Documentation?
http://docs.athemes.com/category/8-sydney

Kind Regards, Roman.