.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: black;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    top: 100%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 1s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

a {
  text-decoration: none;
  color: white;
  font-family: Verdana;
  padding-left: 10px;
}