.sectooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px black;
  }
  
  .sectooltip .sectooltiptext {
    visibility: hidden;
    width: 150px;
    background-color: black;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    
    /* Position the sectooltip */
    position: absolute;
    z-index: 20;
    bottom: 100%;
    left: 50%;
    margin-left: -60px;
  }
  
  .sectooltip:hover .sectooltiptext {
    visibility: visible;
  }