垂直居中布局

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6 </head>
 7 
 8 <style>
 9     *{
10         margin: 0;
11         padding: 0;
12     }
13     .main{
14         width:300px;
15         height:400px;
16         position: relative;
17         top:0;
18         left:0;
19         background-color: antiquewhite;
20     }
21     .center{
22         position: absolute;
23         width:100px;
24         height:100px;
25         top:50%;
26         left:50%;
27         background-color: red;
28         transform: translate(-50%,-50%);
29     }
30     
31 </style>
32 <body>
33 
34 
35 <div class="main">
36     <div class="center">
37     </div>
38 </div>
39 </body>
40 </html>

效果：

第二种：flex布局垂直居中

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6 
 7     <style>
 8         html,body {
 9             width: 100%;
10             height: 100%;
11             margin: 0;
12             padding: 0;
13         }
14         
15         .main{
16             position: absolute;
17             display: flex;
18             align-items:center;
19             justify-content: center;
20             width:500px;
21             height:600px;
22             background-color: orange;
23 
24         }
25         .content {
26             width:300px;
27             height:300px;
28             background-color: red;
29         }
30     </style>
31 </head>
32 <body>
33 <div class="main">
34     <div class="content"></div>
35 </div>
36 
37 </body>
38 </html>

效果：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<style>
    *{
        margin: 0;
        padding: 0;
    }
    .main{
        width:300px;
        height:400px;
        position: relative;
        top:0;
        left:0;
        background-color: antiquewhite;
    }
    .center{
        position: absolute;
        width:100px;
        height:100px;
        top:50%;
        left:50%;
        background-color: red;
        transform: translate(-50%,-50%);
    }
    
</style>
<body>


<div class="main">
    <div class="center">
    </div>
</div>
</body>
</html>

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原文地址：https://www.cnblogs.com/yinhao-jack/p/11745436.html