背景尺寸

背景尺寸

用于控制元素背景图像尺寸的功能类。

Class Styles

Class	Styles
`bg-auto`	`background-size: auto;`
`bg-cover`	`background-size: cover;`
`bg-contain`	`background-size: contain;`
`bg-(<custom-property>)`	`background-size: var(<custom-property>);`
`bg-[<value>]`	`background-size: <value>;`

bg-auto

background-size: auto;

bg-cover

background-size: cover;

bg-contain

background-size: contain;

bg-(<custom-property>)

background-size: var(<custom-property>);

bg-[<value>]

background-size: <value>;

示例

使用 bg-cover 功能类将背景图像缩放至填满背景层，必要时会裁剪图像：

<div class="bg-[url(/img/mountains.jpg)] bg-cover bg-center"></div>

使用 bg-contain 功能类将背景图像缩放至外边缘，不进行裁剪或拉伸：

<div class="bg-[url(/img/mountains.jpg)] bg-contain bg-center"></div>

使用 bg-auto 功能类以默认尺寸显示背景图像：

<div class="bg-[url(/img/mountains.jpg)] bg-auto bg-center bg-no-repeat"></div>

Use the bg-[<value>] syntax to set the background image size based on a completely custom value:

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

For CSS variables, you can also use the bg-(<custom-property>) syntax:

<div class="bg-(--my-image-size) ...">  <!-- ... --></div>

This is just a shorthand for bg-[var(<custom-property>)] that adds the var() function for you automatically.

Prefix a background-size utility with a breakpoint variant like md: to only apply the utility at medium screen sizes and above:

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

Learn more about using variants in the variants documentation.