css3图片背景定位全屏

background-image: url(../images/bg0_rain_day.jpg); background-size: auto 100%;/*调整图片大小*/ background-attachment: fixed;/*scroll: 随着页面的滚动轴背景图片将移动 fixed: 随着页面的滚动轴背景图片不会移动 inherit: 继承*/}