ul.exhibitions li{ float:lewft; position:relative; width:210px;  overflow:hidden; margin:0 0px 0px 0; }
ul.exhibitions li a{ display:mblock; width:210  overflow:mhidden; }

ul.exhibitions li a div.additional{ position:absolute; width:210px; float:left; background-color:#fff; opacity:0.5; color:black; font-weight:bold; bottom:0; left:0; padding:10px; }
.ie ul.exhibitions li a div.additional{ filter:alpha(opacity=75); }