Background-color：#CCC；Background color
Background-img:url(/img/1.jpg);Background image
Background-repeat:no-repeat；Not tiling repeat-x horizontal tile repeat-y vertical tile
Background -position: 30px 40px; or 30% 40%; background image positioning
Background: url(image/1.png) no-repeat center top; background image combination
Background：url(image/1.png) no-repeat center top; combination
