阴影效果 div+css

<style> body {margin:100px;} #login_b {width:200px;height:200px;background:#000;-moz-opacity:0.2; filter:alpha(opacity=20);margin:-30px 0 0 600px; position:absolute;} #login_t { z-index:10;border:1px solid #006600;width:200px;height:200px;background:#FFF;margin:-35px 0 0 595px; position:absolute;} #info{ background:#009900; height:155px;} </style> <div id="info"> <div id="login_t">test</div> <div id="login_b"></div> </div>