A brief overview of 4 ideas for using CSS to achieve horizontal centering

Horizontal centering is a frequently encountered problem. It seems that there are many ways, and all roads lead to Rome. But after a systematic review, it actually revolves around several ideas. This article will introduce 4 ideas about horizontal centering. Friends who are interested can refer to it

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Horizontal centering is often encountered The problem. It seems that there are many ways, and all roads lead to Rome. But after a systematic review, it actually revolves around several ideas. This article will introduce 4 ideas about horizontal centering. Friends who are interested can refer to it!

Idea 1: Set text-align:center in the parent element to achieve horizontal centering of inline elements

The display of the element is set to inline-block, so that the child elements become inline elements

[Note] To be compatible with IE7-browser, you can use display:inline;zoom:1; Achieve the effect of inline-block

<style>   
.parent{text-align: center;}       
.child{display: inline-block;}   
</style>    
<p class="parent" style="background-color: gray;">   
  <p class="child" style="background-color: lightblue;">DEMO</p>   
</p>

##Idea 2: Set it in its own element margin: 0 auto implements horizontal centering of block-level elements

[1]Display the sub-element as a table, making the sub-element a block-level element. At the same time, the table is also wrapped, and the width is expanded by the content

[Note] If you want to be compatible with IE7-browser, you can change the structure of the child to

DEMO

<style>   
.child{   
    display: table;   
    margin: 0 auto;   
}   
</style>    
<p class="parent" style="background-color: gray;">   
  <p class="child" style="background-color: lightblue;">DEMO</p>   
</p>

【2】If the child element has a fixed width, you can use

absolute positioningbox modelattribute, to achieve the centering effect; if the width is not set, the child element is stretched

<style>   
.parent{   
  position: relative;   
}   
.child{   
 position: absolute;   
 left: 0;   
 rightright: 0;   
 margin: 0 auto;   
 width: 50px;   
}   
</style>    
<p class="parent" style="background-color: gray;height: 20px;">   
    <p class="child" style="background-color: lightblue;">DEMO</p>      
</p>

##Three ideas: use the offset attribute of absolute positioning Achieve horizontal centering
【1】With translate() displacement
function
The percentage of the translate function is relative to itself width, so left:50% combined with translateX(-50%) can achieve a centered effect
　[Note] IE9-browser does not support

<style>   
.parent{   
  position: relative;   
}   
.child{   
  position: absolute;   
  left: 50%;   
  transform:translateX(-50%);   
}   
</style>    
<p class="parent" style="background-color: gray;height: 20px;">   
  <p class="child" style="background-color: lightblue;">DEMO</p>   
</p>

【2】With relative

The offset attribute of relative is relative to itself, because the child element has been set to absolute, so if you use relative, you need to add a layer of
　[Note] This method is fully compatible, but it adds an html structure

<style>   
.parent{   
  position: relative;   
}   
.childWrap{   
  position: absolute;   
  left: 50%;   
}   
.child{   
  position: relative;   
  left: -50%;   
}   
</style>    
<p class="parent" style="background-color: gray;height: 20px;">   
  <p class="childWrap">   
    <p class="child" style="background-color: lightblue;">DEMO</p>    
  </p>      
</p>

【 3】With negative margin

The percentage of margin is relative to the containing block, so a layer of

structure needs to be added. Since the default value of width is auto, when negative margin is set, width will also increase. Therefore, fixed-width processing is required at this time
　[Note] Although it is fully compatible, it requires additional page structure and fixed-width processing, so the application scenarios are limited

<style>   
.parent{   
  position: relative;   
}   
.childWrap{   
  position: absolute;   
  left: 50%;   
}   
.child{   
  width:50px;   
  margin-left:-50%;   
}   
</style>    
<p class="parent" style="background-color: gray;height: 20px;">   
  <p class="childWrap">   
    <p class="child" style="background-color: lightblue;">DEMO</p>    
  </p>      
</p>

Idea 4: Use the flexible box model flex to achieve horizontal centering
[Note] IE9-browser does not support
[1] In scaling Set the main axis alignment on the container jusify-content:center

<style>   
.parent{   
  display: flex;   
  justify-content: center;   
}   
</style>    
<p class="parent" style="background-color: gray;">   
    <p class="child" style="background-color: lightblue;">DEMO</p>      
</p>

【2】Set margin on the scalable project: 0 auto

<style>   
.parent{display: flex;}   
.child{margin: 0 auto;}   
</style>    
<p class="parent" style="background-color: gray;">   
    <p class="child" style="background-color: lightblue;">DEMO</p>      
</p>

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