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How to make CSS width to fill parent?

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天命终不由人
天命终不由人 2020-12-13 11:32

I am sure this problem has been asked before but I cannot seem to find the answer.

I have the following markup:


    


        

      

      
      

        

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                 长情又很酷 
              
              
    
                
                   长情又很酷
                                             
                
                
                (楼主)
            
              
                  
    
                2020-12-13 12:34
              
    

            
    
            
    
              
              

    box-sizing: border-box;
width: 100%;
padding: 5px;

    

    box-sizing: border box; makes it so that padding, margin and border are included in the width calculations.
    

    MDN
    
    
    
             
    
                                                        
    
            
    
            
    
              
                
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