盒子居中方法

发布于：2024-08-13 ⋅ 阅读:(88) ⋅ 点赞:(0)

 flex

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        display: flex;
        justify-content: center;
        align-items: center;
        width: 800px;
        height: 400px;
        background: #0eb40b;
    }

    .center{
        width: 100px;
        height: 100px;
        background: #1122b9;
    }
  
</style>
<body>
    
   <div class="box">
    <div class="center">center</div>
   </div>
    
</body>
</html>

定位  transform 子绝父相

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        position: relative;
        width: 800px;
        height: 400px;
        background: #0eb40b;
    }

    .center{
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        width: 100px;
        height: 100px;
        background: #1122b9;
    }
  
</style>
<body>
    
   <div class="box">
    <div class="center">center</div>
   </div>
    
</body>
</html>

定位 margin 自身盒子宽/高一半  子绝父相

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        position: relative;
        width: 800px;
        height: 400px;
        background: #0eb40b;
    }

    .center{
        position: absolute;
        top: 50%;
        left: 50%;
        margin-top: -100px;
        margin-left: -100px;
        width: 200px;
        height: 200px;
        background: #1122b9;
    }
  
</style>
<body>
    
   <div class="box">
    <div class="center">center</div>
   </div>
    
</body>
</html>

margin:auto; 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        position: relative;
        width: 800px;
        height: 400px;
        background: #0eb40b;
    }

    .center{
        position: absolute;
        margin:auto;
        top:0;
        left:0;
        right: 0;
        bottom: 0;
        width: 200px;
        height: 200px;
        background: #1122b9;
    }
  
</style>
<body>
    
   <div class="box">
    <div class="center">center</div>
   </div>
    
</body>
</html>

子绝父相后 父子盒子的空间距离

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        position: relative;
        width: 800px;
        height: 400px;
        background: #0eb40b;
    }

    .center{
        position: absolute;
        width: 200px;
        height: 200px;
        background: #1122b9;
        /* 父盒子box的width - 子盒子center的width  的一半 */
        margin-left: 300px; 
        /* 父盒子box的height - 子盒子center的height  的一半 */
        margin-top: 100px;
    }
  
</style>
<body>
    
   <div class="box">
    <div class="center">center</div>
   </div>
    
</body>
</html>

  display: table-cell;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        display: table-cell;
        text-align: center;
        vertical-align: middle;
        width: 800px;
        height: 400px;
        background: #0eb40b;
    }

    .center{
        display: inline-block;
        width: 200px;
        height: 200px;
        background: #1122b9;
    }
  
</style>
<body>
    
   <div class="box">
    <div class="center">center</div>
   </div>
    
</body>
</html>

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