background: -moz-linear-gradient(top, blue, white);//-webkit-linear-gradient(top, blue, white)谷歌
线性渐变，-moz-火狐浏览器，top为方向，blue为起点颜色，white为结束颜色
top
left
background: -moz-linear-gradient(left top, blue, white);//谷歌改前缀
左上角
background: -moz-linear-gradient(left center, black, white);
background: -moz-linear-gradient(left 20deg, black, white);
left_center
left_20°
原文：http://www.cnblogs.com/yumeixin/p/5007904.html