The background of this layout should be an image. Please use Change Background feature to change the background of this layout.
(Can be found under DESIGN tab)
Please Drag & Drop YOUTUBE element into this area.
This is the background of the Bottom Area shown below. It'll display correctly on published site.
If you don't want background for the bottom area, simply hover over the bottom of this image to delete it. The background of the bottom area will be a solid dark color.