<style type="text/css"> .box{ 300px; height:200px; position:relative; background:red; cursor:pointer; } .box .bmbox{ 300px; height:200px; background:black; position:absolute; bottom:0px; left:0px; display:none; font:12px/30px "宋体"; color:white; text-align:center; } .box:hover .bmbox{ 300px; height:200px; background:blue; position:absolute; bottom:0px; left:0px; display:block; font:12px/30px "宋体"; color:white; text-align:center; filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5; } </style> </head> <body> <div class="box"> <div class="bmbox">图标</div> </div> </body>