9. In the Layers panel, select the Banner Art, Left Column, and Right Column layers.
10. With the Move tool, Shift-drag the selected layers down until the top is even with the top of
the blue button stack on the left.Now you’ll take the two-column layout and make each column fill the width of the artboard. But
first you’ll need to accommodate them by making the artboard taller.
11. Select the iPhone artboard in the Layers panel, and then, with the Artboard tool, drag the
bottom handle of the iPhone artboard until the transformation values next to the pointer
indicate that it’s 2800 px tall.