.xstooltip 
{
    visibility: hidden; 
    position: absolute; 
    top: 0;  
    left: 0; 
    z-index: 2; 
    width: 350px;
    font: normal 8pt sans-serif;
    text-align:left; 
    padding: 3px; 
    background-color: lightyellow;
    border: solid 1px yellow;
}