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

.tooltip .tooltiptext {
  visibility: hidden;
  width: 250px;
  background-color: #303030;
  color: #fff;
  text-align: left;
  border-radius: 6px;
  padding: 5px 10px 5px 10px;
  
  /* Position the tooltip */
  position: absolute;
  z-index: 1;
  top: -5px;
  left: 105%;
}

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