-webkit-linear-gradient( bottom,transparent ,#000 100%)
这样实现了背景色的渐变，希望实现背景色是中间深色，逐渐往上和往下变成透明，css该怎么写？
回复讨论(解决方案)
FILTER: progid:DXImageTransform.Microsoft.Gradient(gradientType=0,startColorStr=#fff,endColorStr=#000); /*IE 6 7 8*/
background: -ms-linear-gradient(top, #fff, #000); /* IE 10 */
background:-moz-linear-gradient(top,#fff,#000);/*火狐*/
background:-webkit-gradient(linear, 0% 0%, 0% 100%,from(#fff), to(#000));/*谷歌*/
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#fff), to(#000)); /* Safari 4-5, Chrome 1-9*/
background: -webkit-linear-gradient(top, #fff, #000); /*Safari5.1 Chrome 10+*/
background: -o-linear-gradient(top, #fff, #000); /*Opera 11.10+*/