In CSS, you can use the "z-index" attribute to set the layer on top. You only need to set the "z-index:auto" style to the layer element. The z-index attribute sets the stacking order of elements. Elements with a higher stacking order will always be in front of elements with a lower stacking order.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

Method: Set styles for elements

z-index:auto

auto can be defined as a value (integer number). The larger it is, the higher it is placed. For example, it can be defined as: z-index:999.

The premise is that div is a positioned element.

Example:

   
  
这是一个标题
  
默认的 z-index 是 0。Z-index -1 拥有更低的优先级。
  

Effect:

Recommended learning:css video tutorial

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