标签：back code gradient tom ack div webkit 背景 color
background-image: -moz-linear-gradient(top, rgba(0,0,0,0), rgba(0,0,0,0.5) 75%);
background-image: -webkit-linear-gradient(top, rgba(0,0,0,0), rgba(0,0,0,0.5) 75%);
background-image: -o-linear-gradient(top, rgba(0,0,0,0), rgba(0,0,0,0.5) 75%);
background-image: -ms-linear-gradient(top, rgba(0,0,0,0), rgba(0,0,0,0.5) 75%);
background-image: linear-gradient(to bottom, rgba(0,0,0,0), rgba(0,0,0,0.5) 75%);
linear-gradient：to 方位词
-前缀-linear-gradient：方位词
标签：back code gradient tom ack div webkit 背景 color
原文地址：http://www.cnblogs.com/padding1015/p/6034773.html
