Select the white rectangular highlights and bring them to the front (Ctrl-F). With the white rectangles selected, select the Transparency Tool (the wine glass icon) and apply a Linear Transparency, type Mix, dragging the fill arrow as shown beyond the bottom of the rectangles. Add two slim rectangles, the same height as the blue background, to either side of the large blue rectangle. With the Fill Tool, apply a Circular Fill to each of the slender rectangles using the RGB colors shown and adjusting the center of the fill and the fill path arrows as shown on the bottom illustration. These slim rectangles will be the side of the glass.