To change the size of the artboard, choose Artboard, and then set the size and orientation for the artboard.

To change the color of the artboard, choose Transparency. Select Simulate Colored Paper, click the top color swatch, and select a new color using the Color dialog box.

Changing the color of the artboard lets you view your document as it might appear when printed on colored paper. For example, if you draw a blue object on a yellow background, the object appears green. The simulation is only performed when the transparency grid is not shown.