#tetracase {
   position:relative;
   overflow:hidden;
   height:200px;
   width:400px;
   font-size:12;
}

#tetracase a {
   font-weight:bold;
   font-size:120%;
}

.tetradiv {
   position:absolute;
   overflow:hidden;
   top:0;
   left:400px;
   width:194px;
   height:200px;
}