背景尺寸

​基本用法

¥Basic usage

​自动

¥Auto

使用 bg-auto 以默认大小显示背景图片。

¥Use bg-auto to display the background image at its default size.

<div class="bg-auto bg-no-repeat bg-center ..." style="background-image: url(...)"></div>

​覆盖

¥Cover

使用 bg-cover 缩放背景图片，直到它填满背景层。

¥Use bg-cover to scale the background image until it fills the background layer.

<div class="bg-cover bg-center ..." style="background-image: url(...)"></div>

​包含

¥Contain

使用 bg-contain 将背景图片缩放到外边缘，而无需裁剪或拉伸。

¥Use bg-contain to scale the background image to the outer edges without cropping or stretching.

<div class="bg-contain bg-center ..." style="background-image: url(...)"></div>

​有条件地应用

​悬停、聚焦和其他状态

Tailwind lets you conditionally apply utility classes in different states using variant modifiers. For example, use hover:bg-contain to only apply the bg-contain utility on hover.

<div class="bg-auto hover:bg-contain">
  <!-- ... -->
</div>

For a complete list of all available state modifiers, check out the Hover, Focus, & Other States documentation.

​断点和媒体查询

You can also use variant modifiers to target media queries like responsive breakpoints, dark mode, prefers-reduced-motion, and more. For example, use md:bg-contain to apply the bg-contain utility at only medium screen sizes and above.

<div class="bg-auto md:bg-contain">
  <!-- ... -->
</div>

To learn more, check out the documentation on Responsive Design, Dark Mode and other media query modifiers.

​使用自定义值

¥Using custom values

​自定义主题

¥Customizing your theme

默认情况下，Tailwind 提供适用于 auto、cover 和 contain 背景尺寸的工具。你可以通过编辑配置的 theme.backgroundSize 部分来更改、添加或删除它们。

¥By default, Tailwind provides utilities for auto, cover, and contain background sizes. You can change, add, or remove these by editing the theme.backgroundSize section of your config.

module.exports = {
  theme: {
    backgroundSize: {
      'auto': 'auto',
      'cover': 'cover',
      'contain': 'contain',
      '50%': '50%',
      '16': '4rem',
    }
  }
}

在 主题定制 文档中了解有关自定义默认主题的更多信息。

¥Learn more about customizing the default theme in the theme customization documentation.

​任意值

¥Arbitrary values

If you need to use a one-off background-size value that doesn’t make sense to include in your theme, use square brackets to generate a property on the fly using any arbitrary value.

<div class="bg-[length:200px_100px]">
  <!-- ... -->
</div>

Learn more about arbitrary value support in the arbitrary values documentation.