How to use CSS to overlap two DIVs-CSS Tutorial-php.cn

How to use CSS to overlap two DIVs

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Release： 2017-11-28 11:52:09

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If you implement a DIV overlap and want them to overlap in the order we want, this requires CSS Absolute positioningTo achieve this, today I will tell you about the CSS of overlapping styles. Implementation.

DIV overlap CSS allows DIVs to overlap and overlap. CSS allows two DIVs or multiple DIVs to overlap and overlap in order.

It requires CSS to allow DIVs to overlap and overlap in the desired order, that is, CSS absolute positioning is implemented.

Overlapping styles require main CSS style explanation

1, z-index Overlapping order attribute

2, position:relative Set the object properties to positionable (overlapping) with position:absolute

3, left right top bottomAbsolute positioning specific position settings

Coordinated style

1, css width

2, css height

3, background In order to observe the effect, we set different background colors for different DIVs. Difference

Next, we will provide you with an instance layout of overlapping and superimposing DIVs according to your own wishes. We create 4 new DIV boxes, one large DIV box with the CSS name ".div-relative", three small DIV boxes placed in the first large DIV object box, and the DIV names are ".div-a", ".div-b", ".div-c".

Unsorted, sorted DIV cascading and overlapping examples

The complete HTML source code is as follows:

<!DOCTYPE html> 
<html> 
<head> 
<meta charset="utf-8" /> 
<title>div重叠 叠加实例 未排层叠顺序 www.divcss5.com</title> 
<style> 
.div-relative{position:relative; color:#000; border:1px solid #000; width:500px; height:400px} 
.div-a{ position:absolute; left:30px; top:30px; background:#F00; width:200px; height:100px} 
/* css注释说明： 背景为红色 */ 
.div-b{ position:absolute; left:50px; top:60px; background:#FF0; width:400px; height:200px} 
/* 背景为黄色 */ 
.div-c{ position:absolute; left:80px; top:80px; background:#00F; width:300px; height:300px} 
/* DIV背景颜色为蓝色 */ 
</style> 
</head> 
<body> 
<div class="div-relative"> 
<div class="div-a">我背景为红色</div> 
<div class="div-b">我背景为黄色</div> 
<div class="div-c">我背景为蓝色</div> 
</div> 
</body> 
</html>

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Example description:

We use position to achieve absolute positioning, set the position:relative attribute on the parent, and set position:absolute on the child plus left or right and top or bottom to achieve arbitrary positioning of the child within the parent. In the original case, the overlap is arranged in the order of the DIV codes themselves. The later the DIV box is entered, the closer it is to the front (floating on top). In addition to changing the html order of the div code in the source code itself, we can also use css z-index to implement the order of DIV layers.

I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!