但是对于更复杂的图像，比如边栏的背景，我们有意地使用比默认显示区域大的图像并适当地进行定位。

However, for more complex images, such as the background for the sidebar, we use images purposely made larger than their default display area and position them appropriately.

youdao

形成背景右上角的宽图像定位在 sidebar 容器的右上角。

The very wide image that forms the top right corner of the background is positioned in the top right of the sidebar container.

youdao

形成背景左上角的小图像定位在gutter容器的左上角。

The smaller image that forms the top left corner of the background image is positioned in the top left of the gutter container.

youdao