剪切并复制选区到一个新图层，一般这样做将会丢失掉选取的图层样式，所以在这之前我们必须给右下角图层重复添加一次样式。

Cut and paste the selection to a new layer. Once you've re-pasted the corner you cut off to a new layer, you would have lost its layer styles.

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现在我们在背景图层前添加一个新的图层。

Now, we will add a new layer in front of the background layer and behind the others.

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创建一个新的图层，并将其移至建筑的图层的下面，接下来要在背景上添加一点颜色。

Create a new layer and move it below the building layers. A little color will be added to the background.

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