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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:
<html>
<head>
<style type="text/css">
img.x
{
position:absolute;
left:0px;
top:0px;
z-index:-1
}
</style>
</head>
<body>
<h1>这是一个标题</h1>
<img class="x" src="/i/eg_mouse.jpg" / alt="How to set layer on top in css" >
<p>默认的 z-index 是 0。Z-index -1 拥有更低的优先级。</p>
</body>
</html>Effect:
Recommended learning: css video tutorial
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