.tool-tip {
  position: relative;
}

.tool-tip .tooltiptext {
  visibility: hidden;
  opacity: 0;
  width: auto;
  font-size: 18px;
  background-color: black;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px 10px;
  position: absolute;
  z-index: 1;
  top: 150%;
  left: 50%;
  margin-left: -60px;
  transition: opacity 0.5s;
}

.tool-tip .tooltiptext::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: transparent transparent black transparent;
}

.tool-tip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}