background의 통합 쓰기 방식

background: [background-color]           

            [background-image]                   

            [background-repeat]                     
            [background-attachment]            

            [background-position] / [ background-size]               
            [background-origin]                    

            [background-clip];                        

  ：

 
  
background:#5f5d5d
             url("../images/onePageBG.jpg")
             no-repeat
             fixed
             0% 0%/100% 100%;