a.tooltip                   {   position: relative;   text-decoration: none;   color: blue; } 
a.tooltip span           {   display: none;  } 
a.tooltip:hover span { position: absolute;   display: block;   top: 1.5em;   left: 2em;   border: 1px solid black;   background-color:NavajoWhite;   padding: 0.2em; z-index:11; opacity:1; }