CSS3灰度和虚化效果

#huidu{
position: absolute;
width:100%;
height:380%;
top:10%;
background-color:#676767;
filter:alpha(opacity=90);
-moz-opacity:0.9;
opacity:0.9;
position:absolute;
top:0;
left:0;
z-index:99;
}
.xuhua{
background:-webkit-gradient(linear, 10% 10%，100% 100%， color-stop(0.14, rgb(255,0,0)), color-stop(0.5, rgb(255,255,0)), color-stop(1, rgb(0,0,255));-webkit-gradient(linear, 0 0, 0 100%, from(＃2074af), to(＃2c91d2));-moz-linear-gradient(10 10 90deg, rgb(25,0,0) 14%, rgb(255,255,0) 50%, rgb(0,0,255) 100%);
filter:progid: .Microsoft.gradient(startColorstr=＃00ffff,endColorstr=＃9fffff,grandientType=1);

}