/* Tooltip container */
.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
  }
  
  /* Tooltip text */
  .tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: black;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
  
    /* Position the tooltip */
    position: absolute;
    z-index: 1;
    bottom: 150%;
    left: 50%;
    margin-left: -60px;
  }
  
  .tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    bottom: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: black transparent transparent transparent;
  }

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

  /* usage of tooltip (CONTAINER and TOOLTIP_TEXT are variable):
     <CONTAINER class="tooltip">Hover over me
      <span class="tooltiptext">TOOLTIP_TEXT</span>
    </CONTAINER>
  */