.tooltip {
    position: relative;
    display: inline-block;
  /*  border-bottom: 1px dotted black;*/
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: white;
    color: black;
    text-align: center;
    border-radius: 3px;
    padding: 3px 0;
    font-size: 12px;
    font-weight:normal;
    /* Position the tooltip */
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -100px;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
}