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                            盒子模型
    content
    margin
    paddi
    border

~~~
 /* box-sizing:border-box
    會改變他的with height 

       給border padding 不會改變他的with  height 
    */
box-sizing: border-box;
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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