can we assign width to li

Question

i have following html page with UL and LI, i try to assign width to each LI but can\'t see cay success

   
   
                     
        
        

          

            
            

              
              

            
    


                                 
              
            
                          
    

        
         

                验证码
                

                  
                
                

                   看不清?
                
              
                                  

                    
   
                 
             
              
提交回复