/* https://www.w3schools.com/css/tryit.asp?filename=trycss_tooltip_top */
.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip .tooltiptext {
  border-style: dotted;
  border-color: lightsteelblue;
  visibility: hidden;
  width: 120px;
  background-color: white;
  color: lightsteelblue;
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  
  /* Position the tooltip */
  position: absolute;
  z-index: 1;
  top: 100%;
  left: 50%;
  margin-left: -60px;
}

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