CSS3 Box shadow to half of the div

Question

I want to apply the box shadow to just half of the div. I searched a lot in Google but failed. Here is the code for simple box shadow.

                  
        
        

          

            
            

              
              

            
    


                                 
              
            
                          
    

        
         

                验证码
                

                  
                
                

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