a.info{
    position:relative; /*this is the key*/
    z-index:19; background-color:#e9e9e9;
    color:#1A162A;
    text-decoration:none}

a.info:hover{z-index:20; background-color:#FFFFA0}

a.info span{display: none}

a.info:hover span{ /*the span will display just on :hover state*/
    display:block;
    position:absolute;
    top:2em; left:2em; width:40em;
    border:1px solid #d4d4d4;
    background-color:#f3f3f3; color:#000;
    text-align: center
    
    }
    
a.info_small{
    position:relative; /*this is the key*/
    z-index:19; background-color:#e9e9e9;
    color:#1A162A;
    text-decoration:none}

a.info_small:hover{z-index:20; background-color:#FFFFA0}

a.info_small span{display: none}

a.info_small:hover span{ /*the span will display just on :hover state*/
    display:block;
    position:absolute;
    top:2em; left:2em; width:20em;
    border:1px solid #d4d4d4;
    background-color:#f3f3f3; color:#000;
    text-align: center}