圆角、阴影、渐变、透明

    /*圆角*/    -moz-border-radius:4px;    -webkit-border-radius:4px;    border-radius:4px;    /*阴影*/    -moz-box-shadow:1px 1px 1px #666;    -webkit-box-shadow:1px 1px 1px #666;    box-shadow:1px 1px 1px #666;    /*渐变*/    background:-webkit-gradient(linear, 0 0, 0 bottom, from(#9F9), to(#393));    background:-moz-linear-gradient(#9F9, #393);    -pie-background:linear-gradient(#9F9, #393);    /*透明*/    filter:alpha(opacity=50);    -moz-opacity:0.5;    -khtml-opacity: 0.5;    opacity: 0.5;