"

From 2013.igem.org

.pop {

   width:20px;
   position: relative;
   top: 0px;
   left: 0px;
 display: block; }
 .pop .pop_menu {
   display: none;
   -moz-border-radius: 3px;
   -webkit-border-radius: 3px; }
 .pop .pop_toggle {
   background-image: url();
   background-repeat: no-repeat;
   position: absolute;
   width: 29px;
   height: 14px;
   overflow: hidden;
   cursor: pointer; }

.active .pop_menu {

 display: block;
 background-color: #FFFFFF;
 text-align:center;
 font-size:16px;
 position: absolute;
 padding: 5px;
 width: 17em; }

1. mem10_content {

   width: 34em;

}

 .active .pop_menu a {
   color: blue; }

.active .pop_toggle {

 z-index: 2000;
 position: absolute;
 top: 0;
 display:
 left: 0;
 background-image: url(); }