今天逛的时候发现了一个有趣的css3实现的背景效果，代码实现
.noaccess {
position: absolute;
width: 300px;
height: 100px;
z-index:;
background-color: #999;
opacity: .5;
top:;
bottom:;
display: block;
background-image: -webkit-gradient(linear,0 100%,100% 0,color-stop(0.25,rgba(255,255,255,.2)),color-stop(0.25,transparent),color-stop(0.5,transparent),color-stop(0.5,rgba(255,255,255,.2)),color-stop(0.75,rgba(255,255,255,.2)),color-stop(0.75,transparent),to(transparent));
/* background-image: -webkit-linear-gradient(45deg,rgba(255,255,255,.2) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.2) 50%,rgba(255,255,255,.2) 75%,transparent 75%,transparent); */
background-image: -moz-linear-gradient(45deg,rgba(255,255,255,.2) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.2) 50%,rgba(255,255,255,.2) 75%,transparent 75%,transparent);
background-image: -o-linear-gradient(45deg,rgba(255,255,255,.2) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.2) 50%,rgba(255,255,255,.2) 75%,transparent 75%,transparent);
/* background-image: linear-gradient(45deg,rgba(255,255,255,.2) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.2) 50%,rgba(255,255,255,.2) 75%,transparent 75%,transparent); */
-webkit-background-size: 32px 32px;
-moz-background-size: 32px 32px;
-o-background-size: 32px 32px;
background-size: 32px 32px;
}