.pop{
   z-index:2;
   /*position:absolute;*/
   position:fixed;
   border: 1px solid #333333;
   text-align:center;
   background-color: rgba(3,0,0,.5);
}

.cerrar {
   float:right;
   /*margin-right:5px;margin-left:5px; margin-bottom:5px;margin-top:2px;*/
   cursor:pointer;
   font:Verdana, Arial, Helvetica, sans-serif;
   font-size:14px;
   font-weight:bold;
   color:#FFFFFF;
   background-color:#666666;
   width:12px;
   position:relative;
   /*margin-top:-1px;*/
   text-align:center;
}