The easiest way to do this is to go to the Views menu and select Viewport Background.

简单的方法是进入视窗菜单，然后选择视窗背景。

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Now if we rotate the viewport the background image will remain still.

现在，我们如果旋转视角，背景图像仍会保持静止。

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The dimensions of the #header ID class are now in line with the iPhone viewport, and I manually changed the background image to fit in the space.

header ID 类的尺寸现在符合 iPhone 视窗的大小，并且我手动更改了背景图片以适应空间大小。

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