web开发-从零开始-01-常见样式-三目渣:1.width & height 2.background : a.background-color b.background-image:url() c.background-repeat : no-repeat , repeat-x , repeat-y ; d.background-position : 规范顺序 x y ；除了坐标取值外，x可取值：left/center/right；y可取值：top/center/botton; e.background-a