How to use css to center the image vertically and horizontally?

css image horizontal centering

Use margin: 0 auto to achieve image centering is to add css style margin: 0 auto to the image as follows:

<p style="text-align: center; width: 500px; border: green solid 1px;">
<img alt="" src="jgylogo3.gif" style="margin: 0 auto;" />
</p>

Use the horizontal centering attribute of text text- align: center

<p style="text-align: center; width: 500px; border: green solid 1px;">
<img alt="" src="jgylogo3.gif" style="display: inline-block;" />
</p>

css image vertical centering

Use height == row height to achieve vertical centering of the image

This method can only be used if you know the height. The code is as follows:

<p style="text-align: center; width: 500px;height:200px; line-height:200px; border: green solid 1px;">   
<img alt="" src="jgylogo3.gif" style="display: inline-block; vertical-align: middle;" />
</p>

Use table to achieve vertical centering of images

The method of using table is to use the vertical centering attribute of table. The code is as follows:

Here we use display: table; and display: table-cell; to simulate table. This method is not compatible with IE6/IE7. IE67 does not support display: table. If you do not need to support IE67, you can use

Disadvantages: When you set display: table ; May change your original layout

<p style="text-align: center; width: 500px;height:200px; display: table;border: green solid 1px;">
<span style="display: table-cell; vertical-align: middle; ">
<img alt="" src="jgylogo3.gif" style="display: inline-block;" />
</span>
</p>

Use absolute positioning to vertically center the image

If the width and height of the image are known, the code is as follows:

<p style="width: 500px;height:200px; position: relative; border: green solid 1px;">
<img alt="" src="jgylogo3.gif" style="width: 120px; height: 40px;position: absolute; left:50%; top: 50%; margin-left: -60px;margin-top: -20px;" />
</p>

The mobile terminal can use flex layout to achieve vertical centering of CSS images.

The mobile terminal generally has a higher browser version, so you can boldly use flex layout. (For flex layout, refer to the flex layout usage of css3) The demonstration code is as follows:

css代码：
<style type="text/css">
        .ui-flex {            
        display: -webkit-box !important;            
        display: -webkit-flex !important;            
        display: -ms-flexbox !important;            
        display: flex !important;           
         -webkit-flex-wrap: wrap;            
         -ms-flex-wrap: wrap;            
         flex-wrap: wrap
        }       
         .ui-flex, .ui-flex *, .ui-flex :after, .ui-flex :before {           
          box-sizing: border-box
        }       
         .ui-flex.justify-center {            
         -webkit-box-pack: center;            
         -webkit-justify-content: center;            
         -ms-flex-pack: center;            
         justify-content: center
        }        
        .ui-flex.center {            
        -webkit-box-pack: center;            
        -webkit-justify-content: center;            
        -ms-flex-pack: center;            
        justify-content: center;           
         -webkit-box-align: center;           
          -webkit-align-items: center;           
           -ms-flex-align: center;            
           align-items: center
        }    
        </style>
        html代码：
<p class="ui-flex justify-center center" style="border: green solid 1px; width: 500px; height: 200px;">
    <p class="cell">
	<img alt="" src="jgylogo3.gif" style="" />
    </p>
</p>

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