Now that we've created a layout and a custom theme, we need to apply the layout and theme to the display.

现在，我们已经创建了布局和自定义主题，接下来，需要将该布局和主题应用于显示。

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Because there used to be a separation between themes and layouts, the CSS had to follow strict standards so it would work with multiple layout and theme combinations.

由于外观主题和布局的分离，CSS就需要遵循严格的标准才能适应多个布局及外观主题的组合。

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