How to implement CSS pop-up window centering-CSS Tutorial-php.cn

How to implement CSS pop-up window centering

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Release： 2018-06-25 17:03:29

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The following is a simple implementation method for centering pop-up windows. The content is quite good, so I will share it with you now and give it as a reference.

When I was making pages recently, I often encountered the problem of pop-up boxes being centered.

I asked some experts around me and finally figured it out,

Principle of implementation:

1, define a pseudo class for the peripheral box: before

2, define the fixed attribute of the peripheral box

3, Define the content box.

Define peripheral box:

outbox{   
   position:fixed;   
   top:0;   
   rightright:0;   
   bottombottom:0;   
   left:0;   
   display:block;   
   text-align:center;   
}

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Define peripheral box pseudo-class:

outbox:before{   
   content="";   
   width:0;   
   height:100%;   
   display:inline-block;   
   vertical-align:middle;   
}

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Definition content box:

contentbox{   
    display:inline-block;   
    vertical-align:middle;   
    text-align:center;   
 }

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All codes:

<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width,initial-scale=1">
        <title>弹窗居中</title>
        <style type="text/css">
            .outbox:before{   
                content:"";   
                width:0;   
                height:100%;   
                display:inline-block;   
                vertical-align:middle;   
            }   
            .outbox{   
                position:fixed;   
                top:0;   
                right:0;   
                bottom:0;   
                left:0;   
                text-align:center;   
            }   
            .content{   
                width:200px;   
                height:200px;   
                background-color:#ccc;   
                display:inline-block;   
                vertical-align:middle;   
            }   
        </style>
    </head>
    <body>
    <p class="outbox">
        <p class="content">
        </p>
    </p>
    <body>
</html>

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The above is the entire content of this article. I hope it will be helpful to everyone’s study. For more related content, please pay attention to the PHP Chinese website!

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