z-index

示例

基本示例

使用 z-<number> 工具类，如 z-10 和 z-50，来控制元素的堆叠顺序（或三维定位），而不管它的显示顺序：

<div class="z-40 ...">05</div>
<div class="z-30 ...">04</div>
<div class="z-20 ...">03</div>
<div class="z-10 ...">02</div>
<div class="z-0 ...">01</div>

使用负值

要使用负的 z-index 值，请在类名之前添加一个负号，以将其转换为负值：

<div class="...">05</div>
<div class="...">04</div>
<div class="-z-10 ...">03</div>
<div class="...">02</div>
<div class="...">01</div>

使用自定义值

Use the z-[<value>] syntax to set the 堆叠顺序 based on a completely custom value:

<div class="z-[calc(var(--index)+1)] ...">
  <!-- ... -->
</div>

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

<div class="z-(--my-z) ...">
  <!-- ... -->
</div>

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

响应式设计

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

<div class="z-0 md:z-50 ...">
  <!-- ... -->
</div>

Learn more about using variants in the variants documentation.