Background bled into shapes, started off white

My first attempt with SketchUp, was trying to draw 2d rectangles, adding radiused corners, angles, grouping some areas to scale them, deleting remnants and then the background filled my ‘shape’. is there a way to get the whole ‘design’ to look like the rectangle on the right?E-Series EB Rear Floor.skp (186.2 KB)

Part of your shape is a group, explode it.