CSS盒子模型居中方法

谁借莪１个温暖的怀抱￠ 2023-01-03 14:12 105阅读 0赞

### 方法一： ###

利用margin；

<!DOCTYPE html>
    <html>    
    <head>        
    <meta charset="UTF-8">        
    <title>demo</title>    
    </head>    
    <body>        
    <style type="text/css">        
        
    .div1{ 
    width: 100px;
    height: 100px; 
    border: 1px solid #000000;
    }             
    .div2{
    width:40px ; 
    height: 40px; 
    background-color: green;
    }            
    .div22{                
    margin-left: 30px;
    margin-top: 30px; 
    }        
    </style>        
    <div class="div1">            
    <div class="div2 div22">            
    </div>        
    </div>    
    </body>
    </html>

### 方法二 ###

利用css的 position属性；

<!DOCTYPE html>
    <html>    
    <head>        
    <meta charset="UTF-8">        
    <title>demo</title>    
    </head>   
    <body>        
    <style type="text/css">
    
    .div1{  
    width: 100px; 
    height: 100px; 
    border: 1px solid #000000;
    }             
    .div2{ 
    width:40px ; 
    height: 40px; 
    background-color: green;
    }             
    .div11{                
    position: relative;            
    }            
    .div22{                
    position: absolute;
    top:50%;
    left: 50%;
    margin-top: -20px;
    margin-left: -20px;            
    }        
    </style>         
    <div class="div1 div11">            
    <div class="div2 div22">             
    </div>        
    </div>     
    </body>
    </html>

\#\#\#方法三  
利用css3的新增属性table-cell, vertical-align:middle;

\#\#\#方法四  
利用flexbox布局  
直接在父元素上使用flexbox的布局

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>demo</title>
    <style type="text/css">
    .div1 {
    width: 100px;
    height: 100px;
    border: 1px solid #000000;
    }
    .div2 {
    height: 40px;
    width: 40px;
    background-color: green;
    }
    .div11 {
    display: flex;
    /*!*flex-direction: column;*!可写可不写*/
    justify-content: center;
    align-items: center;
    }
    </style>
    </head>
    <body>
    <div class="div1 div11">
    <div class="div2 div22">
    </div>
    </div>
    </body>
    </html>